Cross sectional survey of socioeconomic variations in severity and mechanism of childhood injuries in Trent 1992-7

Socioeconomic status and non-fatal injuries among Canadian adolescents: variations across SES and injury measures

Background

While research to date has consistently demonstrated that socioeconomic status (SES) is inversely associated with injury mortality in both children and adults, findings have been less consistent for non-fatal injuries. The literature addressing SES and injury morbidity among adolescents has been particularly inconclusive. To explore potential explanations for these discrepant research findings, this study uniquely compared the relationship across different measures of SES and different causes of injury (recreation versus non-recreation injuries) within a sample of Canadian adolescents.

Methods

The sample included adolescent participants (aged 12 to 19 years) in the Canadian 1996–1997 cross-sectional National Population Health Survey (n = 6967). Five SES measures (household income, two neighbourhood-level proxy measures, two parental indicators) were examined in relation to three injury outcomes (total, recreation, and non-recreation injuries) using multivariable logistic regression.

Results

Among males, a clear relationship with injury was observed only for a parental SES index, which was positively associated with total and recreation injuries (odds ratios for the highest versus lowest SES category of 1.9 for total and 2.5 for recreation injuries). Among females, there was some evidence of a positive relationship between SES and injuries, particularly for a neighbourhood-level education measure with total and recreation injuries (odds ratios of 1.7 for total and 2.0 for recreation injuries).

Conclusion

The results suggest that differences related to the measures of SES chosen and the causes of injury under study may both contribute to discrepancies in past research on SES and non-fatal injuries among adolescents. To clarify the potential SES-injury relationship among youth, the findings emphasize a need for a greater understanding of the meaning and relevance of different SES measures for adolescents, and for an exploration of the pathways through which SES may be related to injury risk.

Risk of adverse gastrointestinal outcomes in patients taking cyclo-oxygenase-2 inhibitors or conventional non-steroidal anti-inflammatory drugs: population based nested case-control analysis

OBJECTIVE

To determine the risk of an adverse upper gastrointestinal event in patients taking different cyclo-oxygenase-2 inhibitors compared with non-selective non-steroidal anti-inflammatory drugs.

DESIGN

Nested case-control study.

SETTING

367 general practices contributing to the UK QRESEARCH database, spread throughout every strategic health authority and each health board in England, Wales, and Scotland.

PARTICIPANTS

Patients aged 25 or more with a first ever diagnosis of an adverse upper gastrointestinal event (peptic ulcer or haematemesis) between 1 August 2000 and 31 July 2004 and up to 10 controls per case matched for age, sex, calendar time, and practice.

MAIN OUTCOME MEASURES

Unadjusted and adjusted odds ratios for adverse upper gastrointestinal events associated with celecoxib, rofecoxib, ibuprofen, diclofenac, naproxen, other selective and non-selective non-steroidal anti-inflammatory drugs, and aspirin.

RESULTS

The incidence of adverse upper gastrointestinal events was 1.36 per 1000 person years (95% confidence interval 1.34 to 1.39). We identified 9407 incident cases and 88 867 matched controls. Increased risks of adverse gastrointestinal events were associated with current use of cyclo-oxygenase-2 inhibitors and with conventional non-steroidal anti-inflammatory drugs. Risks were reduced after adjustment for confounders but remained significantly increased for naproxen (adjusted odds ratio 2.12, 95% confidence interval 1.73 to 2.58), diclofenac (1.96, 1.78 to 2.15), and rofecoxib (1.56, 1.30 to 1.87) but not for current use of celecoxib (1.11, 0.87 to 1.41). We found clinically important interactions with current use of ulcer healing drugs that removed the increased risks for adverse gastrointestinal events for all groups of non-steroidal anti-inflammatory drugs except diclofenac, which still had an increased odds ratio (1.49, 1.26 to 1.76).

CONCLUSION

No consistent evidence was found of enhanced safety against gastrointestinal events with any of the new cyclo-oxygenase-2 inhibitors compared with non-selective non-steroidal anti-inflammatory drugs. The use of ulcer healing drugs reduced the increased risk of adverse gastrointestinal outcomes with all groups of non-steroidal anti-inflammatory drugs, but for diclofenac the increased risk remained significant.

How useful are home safety behaviours for predicting childhood injury? A cohort study

Little work has examined the utility of home safety behaviours in predicting childhood injury. This study examines the relationship between safety behaviours and child injury using a cohort of 1717 families, with 2357 children aged 0-7 years. Safety behaviours, and sociodemographic and family characteristics were measured using a validated questionnaire, and medically attended injuries were ascertained from medical records. Hospital admission rates were lower amongst children from families with fitted and working smoke alarms [incidence rate ratio (IRR) 0.55, 95% confidence interval (CI) 0.31-0.96], who stored sharp objects safely (IRR 0.44, 95% CI 0.23-0.84) and who had fitted stair gates (IRR 0.57, 95% CI 0.31-1.03). Not having a stair gate and not storing sharp objects safely had high sensitivities and negative predictive values for predicting hospital admission. These findings are unlikely to be explained by reductions in the risk of injuries these items are designed to prevent. Families with a range of safety behaviours may also be 'safer' in other ways. Further exploration of factors that may explain lower injury rates in these families is required. Information on safety behaviours may be useful for targeting and monitoring injury prevention activity.

Epidemiology of traumatic brain injury in children receiving intensive care in the UK

AIMS

To describe the epidemiology of children with traumatic brain injury (TBI) admitted to paediatric intensive care units (PICUs) in the UK.

METHODS

Prospective collection of clinical and demographic information from paediatric and adult intensive care units in the UK and Eire between February 2001 and August 2003.

RESULTS

The UK prevalence rate for children (0-14 years) admitted to intensive care with TBI between February 2001 and August 2003 was 5.6 per 100,000 population per year (95% Poisson exact confidence intervals 5.17 to 6.05). Children admitted to PICUs with TBI were more deprived than the population as a whole (mean Townsend score for TBI admissions 1.19 v 0). The commonest mechanism of injury was a pedestrian accident (36%), most often occurring in children over 10. There was a significant summer peak in admissions in children under 10 years. Time of injury peaked in the late afternoon and early evening, a pattern that remained constant across the days of the week. Injuries involving motor vehicles have the highest mortality rates (23% of vehicle occupants, 12% of pedestrians) compared with cyclists (8%) and falls (3%). In two thirds of admissions (65%) TBI was an isolated injury.

CONCLUSIONS

TBI in children requiring intensive care is more common in those from poorer backgrounds who have been involved in accidents as pedestrians. The summer peak in injury occurrence for 0-10 year olds and late afternoon timing give clear targets for community based injury prevention.

Socioeconomic differences in childhood hospital inpatient service utilisation and costs: prospective cohort study

STUDY OBJECTIVE

To examine the association between socioeconomic position at the time of birth and the use and cost of hospital inpatient services during the first 10 years of life.

DESIGN

Analysis of a database of linked birth registrations, hospital records, and death certificates. Associations between the social class of the head of household and hospital inpatient service utilisation and costs during the first 10 years of life were analysed using multilevel multiple regression modelling.

PARTICIPANTS AND SETTING

All 117 212 children born to women who both lived and delivered in hospital in Oxfordshire or West Berkshire, southern England, during the period 1 January 1979 to 31 December 1988.

MAIN RESULTS

The study showed that children born into social classes II, III-NM, III-M, IV, and V were more likely to be admitted to hospital, spend longer in hospital overall, and generate greater hospital costs than children born into social class I. The adjusted effect regarding hospital inpatient admissions, days, and costs was 1.27 (95% CI: 1.26, 1.27), 1.20 (1.19, 1.21), and 1.50 (1.49, 1.53), respectively, for children born into social class V when compared with children born into social class I. The impact of social class on hospital inpatient admissions, days, and costs was most acutely felt during years 3-10 of life as compared with the first two years of life.

CONCLUSIONS

Health service decision makers need to be alert to the adverse sequelae that might result from socioeconomic disadvantage when planning health services for children. Particular attention should be paid to targeting deprived populations with prevention interventions that are known to be effective.

Neighbourhood social and socio-economic composition and injury risks

AIM

To investigate whether social and socio-economic characteristics of the population within a parish influence childhood injury.

METHODS

The study encompasses all children aged 0-15 y living in Stockholm County over the 3-y period 1999-2001 (about 360,000 children per year), grouped into parish of residence (138 parishes). The effect of parish attributes on injury rate were analysed based on three indices (deprivation, socio-economic status and social integration) derived by a factor analysis of 11 characteristics of the parishes' population, each index being split into three levels. Childhood injury resulting in at least one night of hospitalization during the period 1999-2001 was considered (n = 5540) by index, and rate ratios were calculated for 12 injury causes using parishes forming the best level of the index as the reference group.

RESULTS

Higher levels of deprivation negatively influenced pedestrian injury rates, had a protective effect on other traffic-related injuries, and negatively affected some other types of unintentional injuries. Higher concentrations of people with low socio-economic status did not impact on the risk of traffic and fall injuries, but increased that of burns/scalds and cases of poisoning. Parishes with lower levels of social integration had significantly higher rates of bicycle- and moped-related injuries, and also of self-inflicted ones.

CONCLUSION

Compositional characteristics of the population in a residential area affect injury to varying degrees and direction according to type of injury. The underlying mechanisms are likely to be specific to injury type.

Epidemiology of unintentional injuries in childhood: a population-based survey in general practice

This study aimed to assess the incidence of unintentional injuries presented in general practice, and to identify children at risk from experiencing an unintentional injury. We used the data of all 0-17-year-old children from a representative survey in 96 Dutch general practices in 2001. We computed incidence rates and multilevel multivariate regression analysis in different age strata and identified patient and family characteristics associated with an elevated injury risk. Nine thousand four hundred and eighty-four new injury episodes were identified from 105 353 new health problems presented in general practice, giving an overall incidence rate of 115 per 1000 person years (95% confidence interval [CI] = 113 to 118). Sex and residence in rural areas are strong predictors of injury in all age strata. Also, in children aged 0-4 years, a higher number of siblings is associated with elevated injury risk (> or =3 siblings odds ratio [OR] = 1.57, 95% CI = 1.19 to 2.08) and in the 12-17-year-olds, ethnic background and socioeconomic class are associated with experiencing an injury (non-western children OR = 0.67, 95% CI = 0.54 to 0.81; low socioeconomic class OR = 1.39, 95% CI = 1.22 to 1.58). Unintentional injury is a significant health problem in children in general practice, accounting for 9% of all new health problems in children. In all age groups, boys in rural areas are especially at risk to experience an injury.

A randomized controlled trial of the effect of providing information on accidental injury admissions and their costs to Primary Care Groups and Trusts

BACKGROUND

Primary Care Groups and Trusts (PCG/Ts) are responsible for improving the health of local populations, but there is little evidence of their strategic involvement in accident prevention.

OBJECTIVE

To determine the effect of providing information on local accidental injuries to PCG/Ts on the development of accident prevention strategies.

METHODS

The study is a randomized controlled trial in PCG/Ts in the former Trent Region. Intervention PCG/Ts were sent profiles containing PCG/T specific information on hospital admissions for accidental injury and their costs and on accident prevention interventions. Health promotion leads were surveyed at baseline and three and fifteen months. The primary outcome was whether the PCG/T had a written accident prevention strategy. Secondary outcome measures included other accident prevention activities, prioritization of accident prevention, and knowledge and attitudes towards accident prevention.

RESULTS

At three months 38% of PCG/Ts in the intervention arm had a written accident prevention strategy, compared with 42% in the control arm [difference -4%, 95% confidence interval (CI) -31% to 25%]. At fifteen months these values were 55% in the intervention arm and 50% in the control arm (difference 5%, CI -24% to 33%). There were no statistically significant differences between the groups for any outcome measures.

CONCLUSIONS

Providing profiles containing information on accidental injuries to PCG/Ts did not significantly increase the development of accident prevention strategies, however this study only had sufficient power to detect substantial changes. Larger national studies would be required to detect moderate effects of tailored packages in changing PCG/T behaviour.

Social deprivation and childhood injuries in North and West Belfast

Injuries in childhood represent a major public health concern. North and West Belfast is an area in which a high rate of emergency department attendance due to injury has been observed, and in which social deprivation is widespread. We carried out a cross sectional survey of 479 injuries in children aged 0-12 years presenting to four emergency departments serving North and West Belfast. Injury rates were compared between the most deprived and least deprived areas, selected on the basis of Noble Economic Deprivation scores. A significant correlation between economic deprivation and injury rate was demonstrated (r = 2.14, p < or = 0.001). Children living within the most deprived areas were particularly likely to be involved in road traffic accidents (relative risk RR = 3.25, p = 0.002). We conclude that children living within the most deprived areas of North and West Belfast are at greater risk of injury than those in less deprived areas. Specific causes of injury, for example burns and scalds, high falls, and motor vehicle accidents are particularly associated with deprivation. Targeting should be taken into account when injury prevention strategies are being developed.

Non-legislative interventions for the promotion of cycle helmet wearing by children

BACKGROUND

Helmets reduce bicycle-related head and facial injuries for bicyclists of all ages in all types of crash. We aimed to identify non-legislative interventions that are effective in promoting helmet use among children, so future campaigns can be designed on a firm evidence base.

OBJECTIVES

to assess the effectiveness of non-legislative interventions (compared to a lack of interventions) in increasing helmet use among children; to identify possible reasons for differences in the effectiveness of interventions; to evaluate effectiveness with respect to social group; to identify any adverse consequences of interventions.

SEARCH STRATEGY

We searched 11 electronic databases and manually searched other sources of potentially relevant data.

SELECTION CRITERIA

We included randomised controlled trials, cluster randomised controlled trials and controlled before and after studies. Studies included participants aged 0 to 18 years and described interventions to promote helmet use not requiring enactment of legislation. Studies had to report at least one of the following outcomes: observed helmet wearing; self-reported helmet ownership; self-reported helmet wearing.

DATA COLLECTION AND ANALYSIS

Data were extracted by two reviewers working independently. Study results were adjusted to account for clustering. A random-effects model was used to pool data in meta-analyses. Heterogeneity was explored with sub-group analyses.

MAIN RESULTS

Twenty-two studies were included. The odds of observed helmet wearing were significantly greater amongst those receiving non-legislative interventions (OR 2.30, 95% CI 1.37 to 3.85). Sub-group analysis indicated the effect may be greater for community-based studies (OR 4.30, 95% CI 2.24 to 8.25) and those providing free helmets (OR 4.35, 95% CI 2.13 to 8.89) than for those providing subsidised helmets (OR 2.02, 95% CI 0.98 to 4.17) and for those set in schools (OR 1.82, 95% CI 0.94 to 3.52). We found no significant effect of non-legislative interventions in increasing self-reported helmet ownership, but they were associated with a significant increase in self-reported helmet wearing (OR 3.90, 95% CI 1.42 to 10.69), particularly amongst interventions set in schools (OR 4.73, 95% CI 1.09 to 20.49) but there was significant unexplained heterogeneity between effect sizes for these two outcomes.

AUTHORS' CONCLUSIONS

Community-based studies that include the provision of free helmets alongside an educational component increase observed helmet wearing in the areas in which they are set. There is some evidence that interventions in schools and those providing subsidised helmets may increase observed helmet wearing, but possibly to a lesser extent than those set in communities and those providing free helmets.

Does poverty lead to non-fatal unintentional injuries in rural Vietnam?

The aim of this study was to identify associations between poverty at the household level and unintentional injury morbidity. A cohort consisting of 24,874 person-time episodes, representing 24,776 people living in 5,801 households (classified into rich, middle income and poor by local authorities in 1999) was followed during 2000, in order to identify and assess non-fatal unintentional injuries. Incidence rate ratios were calculated using a Poisson regression model. The results showed that poverty was a risk factor for unintentional injuries generally. When looking at different types of injury, poverty was a risk for home, work and "other" injuries, protective for school injuries, while the risk of traffic injuries was not affected. The results also showed that communes in mountainous areas were at higher risk for home, work and other injuries. Overall, poverty was associated with unintentional injury morbidity. However, the relationship varied by sex, age and type of injury. Specifically, poverty increased the risk for children and elderly people being injured at home, and for adults (15-59 years) being affected by work injuries.

Engagement in safety practices to prevent home injuries in preschool children among white and non-white ethnic minority families

OBJECTIVE

To examine engagement in home safety practices to prevent injuries in preschool children among white and non-white ethnic minority families.

DESIGN

A self completion postal questionnaire assessed sociodemographic characteristics and engagement in home safety practices.

SETTING

Deprived areas in the city of Nottingham, United Kingdom.

SUBJECTS

3906 caregivers of children aged under 5 years.

MAIN OUTCOME MEASURES

Use of fireguards, stair gates, smoke alarms, window locks and safe storage of medicines, sharp objects, and cleaning products.

RESULTS

Of the 3906 families, 3805 gave their ethnic origin of which 16.5% classed themselves as from a non-white ethnic minority. The safety practices most commonly adopted by respondents were safe storage of medicines (87.9%) and use of smoke alarms (72.3%). Respondents from non-white ethnic minorities were significantly less likely to adopt all safety practices except they were less likely than whites to store sharp objects unsafely (odds ratio (OR) 0.68, 95% confidence interval (CI) 0.56 to 0.84). Those from non-white ethnic minorities were significantly more likely to indicate that they "did not know they could get" fireguards (adjusted OR 6.01, 95% CI 2.64 to 13.65), stair gates (adjusted OR 4.47, 95% CI 1.53 to 13.05), and cupboard locks (adjusted OR 3.96, 95% CI 2.77 to 5.66) than whites. They were also significantly more likely to say they would need help fitting fireguards (adjusted OR 1.98, 95% CI 1.03 to 3.81), stair gates (adjusted OR 3.61, 95% CI 2.11 to 6.17), and cupboard locks (adjusted OR 1.88, 95% CI 1.39 to 2.54).

CONCLUSIONS

Our results support the hypothesis that families from non-white ethnic minorities are less likely to engage in some safety practices and illustrate inequalities in access to information regarding the availability and fitting of safety equipment. Further work is required to examine the association between adoption of safety practices and injury rates in children from non-white ethnic minorities.

Neighborhood social composition and injury risks among pre-adolescent and adolescent boys and girls. A study in Stockholm metropolitan

The study investigates the extent to which social and socioeconomic characteristics of a population within a particular living area influence injury risks among young people. The study group comprised pre-adolescent and adolescent boys and girls aged 10-19 living in the Stockholm metropolitan area in Sweden over the three-year period 2000--2002 (about 185,000 subjects each year). Area comparisons were made at parish level (96 parishes) based on three compositional indexes derived from a factor analysis of sixteen population attributes. Thereafter, each factor was transformed into an additive index and divided into three levels. Diagnosis-specific injury risks were then measured by index, considering injury causes with documented social differences (five for boys and three for girls). Injuries resulting in at least one night of hospitalization during the period 2000--2002 were considered. Three main dimensions with regard to the social fabric of the Stockholm metropolitan area were identified: socioeconomic precariousness and ethnic concentration (Factor 1), educational and financial assets (Factor 2), and concentration of well-off citizens of Nordic origin (Factor 3). Lower levels of socioeconomic precariousness and ethnic concentration showed a protective effect on boys in the cases of traffic and sports-related injuries, but an aggravating one in the cases of falls on the same level and violence-related injuries. Level of educational and financial assets did not impact on falls on the same level among boys, but increased the risk of such injuries among girls. Increased risks of traffic-related injuries among boys and of falls on the same level among both boys and girls were found in areas with lower concentrations of well-off citizens of Nordic origin. It is concluded that social and socioeconomic composition of the population in a living area impacts on injury risks of various kinds in a rather specific manner--in magnitude and in kind. The mechanisms via which contextual aspects operate during youth are likely to vary according to type (cause) of injury and gender.

A prospective population based study of childhood injuries: the Velestino town study

BACKGROUND

Unintentional injuries in childhood constitute a significant public health problem. Our purpose is to estimate the incidence of identifiable unintentional childhood injuries of any type and severity, and to document risk factors of non-transient nature.

METHODS

We have undertaken a prospective population-based investigation in a Greek town with a population of 748 children (0-14 years old). All identifiable injuries have been monitored during a twelve-month period through information provided by the health care outlets or educational institutions as well as the police station and the regional hospital.

RESULTS

The overall incidence was 28.2 per 100 person-years (95% confidence interval from 24.4 to 32.0), whereas the incidence of injuries with Hopkins Injury Severity Score equal to or higher than four was 6.3 with 95% confidence interval 4.5 to 8.1. The incidence of total injuries was higher among boys than among girls (p<0.01) and the gender difference was particularly evident among older children. Almost half of the injuries were due to falls and more than 20% were due to cutting. Children of younger and less educated parents have higher risk for injury and children from families with more injuries were more likely to be injured themselves. There was no evidence that somatometric characteristics were associated with injury risk.

CONCLUSION

The incidence of unintentional childhood injuries is high and represents a considerable health burden. Family related variables are important risk factors for childhood injuries, whereas somatometric characteristics play a minimal role.

KEY POINTS

Incidence and risk factors of all injuries in a population-based study among children. About 28 per 100 children got injured over a period of one year. There is evidence that younger paternal age and lower education may be associated with increased injury risk. Family related variables seem to be important risk factors for childhood injuries, whereas somatometric characteristics play minimal role.

Do rates of hospital admission for falls and hip fracture in elderly people vary by socio-economic status?

OBJECTIVE

To determine the relationship between hospital admissions for falls and hip fracture in elderly people and area characteristics such as socio-economic deprivation.

STUDY DESIGN

Ecological study of routinely collected hospital admissions data for falls and hip fracture in people aged 75 years or over for 1992-1997, linked at electoral ward level with characteristics from census data.

METHODS

In total, 42,293 and 17,390 admissions were identified for falls and hip fracture, respectively, from 858 electoral wards in Trent. Rate ratios (RRs) for hospital admissions for falls and hip fracture were calculated by the electoral wards' Townsend score divided by quintiles. RRs were estimated by negative binomial regression and adjusted for the ward characteristics of age, gender, ethnicity, rurality, proportion of elderly people living alone and distance from hospital.

RESULTS

There was a small but statistically significant association at electoral ward level between hospital admissions for falls and the Townsend score, with the most deprived wards having a 10% higher admission rate for falls compared with the most affluent wards (adjusted RR 1.10, 95% CI 1.01-1.19). No association was found between hospital admission for hip fracture and deprivation (adjusted RR 1.05, 95% CI 0.95-1.16).

CONCLUSION

There is some evidence of an association at electoral ward level between hospital admissions for falls and socio-economic deprivation, with higher rates in deprived areas. No such association was found for hip fracture. Further work is required to assess the impact of interventions on reducing inequalities in hospital admission rates for falls in elderly people.

Education was associated with injuries requiring hospital admission

OBJECTIVES

We describe educational inequalities in the incidence of injuries resulting in hospital admission and explore the contribution of exposure variables and chronic diseases, alcohol consumption, and sedative use to the observed inequalities.

STUDY DESIGN AND SETTING

Data from the Dutch prospective GLOBE study were linked to the National Hospital Discharge Register after 7 years of follow-up.

RESULTS

Significantly higher hazard ratios (HRs) of traffic injuries in lower compared with higher educational groups were substantially reduced after adjustment for differences in the use of cars and mopeds between these groups. Significantly increased HRs in occupational, home, and sports (OHS) injuries in lower compared with higher educational groups were reduced after adjustment for higher prevalence rates of chronic diseases, very excessive alcohol consumption, and sedative use in lower educational groups.

CONCLUSION

Exposure variables, chronic diseases, alcohol consumption, and sedative use contribute to educational inequalities in traffic and OHS injuries resulting in hospital admission.

Strengthening the prevention and care of injuries worldwide

The global burden of injuries is enormous, but has often been overlooked in attempts to improve health. We review measures that would strengthen existing efforts to prevent and treat injuries worldwide. Scientifically-based efforts to understand risk factors for the occurrence of injury are needed and they must be translated into prevention programmes that are well designed and assessed. Areas for potential intervention include environmental modification, improved engineering features of motor vehicle and other products, and promotion of safe behaviours through social marketing, legislation, and law enforcement. Treatment efforts need to better define the most high-yield services and to promote these in the form of essential health services. To achieve these changes, there is a need to strengthen the capacity of national institutions to do research on injury control; to design and implement countermeasures that address injury risk factors and deficiencies in injury treatment; and to assess the effectiveness of such countermeasures. Although much work remains to be done in high-income countries, even greater attention is needed in less-developed countries, where injury rates are higher, few injury control activities have been undertaken, and where most of the world's population lives. In almost all areas, injury rates are especially high in the most vulnerable sections of the community, including those of low socioeconomic status. Injury control activities should, therefore, be undertaken in a context of attention to human rights and other broad social issues.

Social disparities in housing and related pediatric injury: a multilevel study

OBJECTIVES

We conducted an ecologic analysis to determine whether housing characteristics mediate the associations between concentration of poverty and pediatric injury and between concentration of racial minorities and pediatric injury and whether the association between housing conditions and pediatric injury is independent of other risks.

METHODS

We created a hierarchical data set by linking individual-level data for pediatric injury with census data. Effect sizes were estimated with a Poisson model.

RESULTS

After adjustment for owner occupancy and the percentage of housing built before 1950, the association between concentration of poverty and pediatric injury was attenuated. For concentration of racial minorities, only percentage of owner occupancy had some mediating effect. In hierarchical models, housing characteristics remained independent and significant predictors of pediatric injury.

CONCLUSIONS

The association between community characteristics and pediatric injury is partially mediated by housing conditions. Risk of pediatric injury associated with housing conditions is independent of other risks.

Cycle helmet ownership and use; a cluster randomised controlled trial in primary school children in deprived areas

AIMS

To assess the effectiveness of two different educational interventions plus free cycle helmets, in increasing cycle helmet ownership and use.

METHODS

A cluster randomised controlled trial was carried out in 28 primary schools in deprived areas of Nottingham, involving 1213 year 5 schoolchildren (age 9 and 10). Children received either a helmet + educational pack (educational pack and order form for free cycle helmet) or a helmet + multifaceted intervention (educational pack, order form for free cycle helmet, school assembly, lesson devoted to cycle helmet education, and an invitation to a school based cycling event).

RESULTS

The helmet + educational pack was as effective as the helmet + multifaceted intervention in terms of helmet ownership (OR 1.51, 95% CI 0.50 to 4.58) and wearing (OR 0.98, 95% CI 0.57 to 1.68). Helmet ownership significantly increased from baseline with both interventions, and wearing significantly increased from baseline with the helmet + educational pack. The interventions reduced the inequality in helmet ownership between children residing in deprived and non-deprived areas that had been present prior to the study.

CONCLUSIONS

An educational pack plus a form to order a free cycle helmet is an effective way of increasing bicycle helmet ownership and use and reduces inequalities in helmet ownership among children in deprived areas. Further work is needed to determine the length of the effect of such interventions.

Iron poisoning in young children: association with the birth of a sibling

BACKGROUND

Iron is a leading cause of death due to poisoning in young children. Because perinatal iron therapy is common, the presence of these tablets, which have a candylike appearence, in the home may pose a hazard to a mother's other young children. We explored the association between iron poisoning in young children and the birth of a sibling.

METHODS

We conducted a population-based case-control study linking health care databases in Ontario. Health care records for the mothers of children less than 3 years of age admitted to hospital with iron poisoning between Apr. 1, 1991, and Mar. 31, 2000, were compared with those for the mothers of age- and sex-matched control children without iron poisoning.

RESULTS

We studied records for 40 children admitted to hospital for iron poisoning. Seventeen cases (42%) occurred within a year (before or after) a sibling's birth. Children whose mothers had given birth to a sibling were almost twice as likely as children whose mothers had not given birth to a sibling to be admitted for iron poisoning within 6 months of birth (adjusted odds ratio [OR] 1.9, 95% confidence interval [CI] 0.9 to 3.9). The postpartum year was associated with a consistently elevated risk, including an almost 4-fold increase in the risk of iron poisoning during the first postpartum month (adjusted OR 3.6, 95% CI 0.8 to 16.5).

INTERPRETATION

Pregnancy is a major risk factor for iron poisoning in young children, and the period immediately after delivery is associated with the greatest risk. Almost half of all hospital admissions for iron poisoning in young children could be prevented by keeping iron supplements safely out of reach in the year before and after the birth of a sibling.

Socioeconomic variation in injury in children and older people: a population based study

OBJECTIVES

To compare hospital admission rates for all causes and specific causes of injury in children and the elderly by a measure of economic deprivation.

STUDY DESIGN

All emergency admissions for Welsh residents from 1997-99 were located to one of 865 electoral tracts, which were grouped into fifths using a measure of socioeconomic deprivation. Standardised admission rates for all ages and 0-14, 15-75, and 75+ year groups for each quintile were calculated with 95% confidence intervals.

RESULTS

There were 90 935 admissions in a population of 2.84 million yielding a crude admission rate of 1601/100 000/year and a standardised rate of 1493/100 000. The ratio of admissions in deprived and affluent areas varied with category of injury and age group. In general, socioeconomic variations in injury rates were much smaller in older people than in children with the exception of pedestrian related injuries where the rates were similar. The largest variations were for injuries sustained in assaults or self inflicted.

CONCLUSIONS

The relationship between socioeconomic position and injury varies by cause and age group. This should be considered when developing area based preventive interventions or monitoring the effectiveness of policies to reduce inequalities in injury occurrence.