The Causal Attribution of Injury to Alcohol Consumption: A Cross-National Meta-Analysis From the Emergency Room Collaborative Alcohol Analysis Project

Multi-level analysis of alcohol-related injury, societal drinking pattern and alcohol control policy: emergency department data from 28 countries

BACKGROUND AND AIMS

Societal-level volume and pattern of drinking and alcohol control policy have received little attention in the alcohol and injury literature. The aim of this study was to estimate the association between alcohol-related injury, individual-level drinking variables, country-level detrimental drinking pattern and alcohol policy.

DESIGN

Probability samples of emergency department (ED) patients from the International Collaborative Alcohol and Injury Study (ICAIS), which includes four collaborative ED studies on alcohol and injury, all using a similar methodology, were analyzed with multi-level modeling of individual-level drinking variables and aggregate-level variables (country drinking pattern and alcohol policy) on alcohol-related injury in 33 ED studies.

SETTING

Sixty-two emergency departments in 28 countries covering five regions.

PARTICIPANTS

A total of 14 390 injured patients arriving to the ED within 6 hours following injury.

MEASURES

Alcohol-related injuries (self-reported drinking prior to the event and causal attribution of injury to drinking) were analyzed in relation to individual-level volume and pattern of drinking, study-level alcohol volume, country detrimental drinking pattern (DDP) and an alcohol policy measure, the International Alcohol Policy and Injury Index (IAPII). The IAPII includes four regulatory domains: availability, vehicular, advertising and drinking context.

FINDINGS

Controlling for demographic characteristics, individual-level drinking and study-level volume, the IAPII was associated significantly with the proportion of both self-reported drinking [confidence interval (CI) = 0.97-0.99; P < 0.001] and causal attribution (CI = 0.97-0.99; P < 0.01) and DDP had little effect on these associations. All four domains were significantly predictive of self-reported drinking [availability (CI = 0.93-0.98, P < 0.01); vehicular (CI = 0.91-0.97, P < 0.001); advertising CI = 0.82-0.94, P < 0.01); and context (CI = 0.93-0.99, P < 0.01], while only the vehicular domain was significantly predictive of causal attribution (CI = 0.92-0.99; P < 0.05).

CONCLUSIONS

The more restrictive the alcohol policy in a country, the lower the rate of alcohol-related injury, with country-level drinking pattern having little effect on this relationship.

Weekly and daily cycle of alcohol use among the U.S. general population

BACKGROUND

Studies such on alcohol and injuries have defined alcohol-related injury as an injury with a positive self-report of alcohol consumption in the 6h prior to the event. However, there is very limited data on the pattern of alcohol use over time of day and day of week among the general population. The aim of this study is to estimate the rate of alcohol use by time of day, and day of week for the U.S. general adult (≥ 18 years) population.

METHODS

This study employed the design of a retrospective cohort study using data collected from three waves (2005-06, 2007-08, 2009-10) of the National Health and Nutrition Examination Survey (NHANES). Incidence rates of overall drinking (≥ 10 g of alcohol) and incidence rates of heavy drinking (≥ 40 g of alcohol) were estimated for day of week, and time of day (in hours). Multivariable Poisson regression models were used to investigate the difference between weekend nights and weekday nights.

RESULTS

The incidence rates (95% confidence interval) of all drinking episodes were 30.5 (29.2-32.0) per 100 person-days and 24.4 (22.8-26.2) per 100 person-days for weekend and the rest of the week, respectively. The incidence rates of heavy drinking episodes were 11.0 (10.2-11.9) and 7.7 (6.8-8.7) for weekend and the rest of the week. Multivariable analysis indicated that risks of overall drinking and heavy drinking were significantly higher (18% and 34%, respectively) during the weekend nights when compared to weekday nights. It was also observed young adults (18-29 years old) were more likely to increase their alcohol use during weekend nights compared to older age groups.

CONCLUSIONS

The general US population, especially young adults are exposed to alcohol and its acute effects at a much higher level during the night, and this in-turn increases the risk of alcohol-related injuries during that time.

Alcohol abuse and the injured host: dysregulation of counterregulatory mechanisms review

Traumatic injury ranks as the number one cause of death for the younger than 44 years age group and fifth leading cause of death overall (www.nationaltraumainstitute.org/home/trauma_statistics.html). Although improved resuscitation of trauma patients has dramatically reduced immediate mortality from hemorrhagic shock, long-term morbidity and mortality continue to be unacceptably high during the postresuscitation period particularly as a result of impaired host immune responses to subsequent challenges such as surgery or infection. Acute alcohol intoxication (AAI) is a significant risk factor for traumatic injury, with intoxicating blood alcohol levels present in more than 40% of injured patients. Severity of trauma, hemorrhagic shock, and injury is higher in intoxicated individuals than that of sober victims, resulting in higher mortality rates in this patient population. Necessary invasive procedures (surgery, anesthesia) and subsequent challenges (infection) that intoxicated trauma victims are frequently subjected to are additional stresses to an already compromised inflammatory and neuroendocrine milieu and further contribute to their morbidity and mortality. Thus, dissecting the dynamic imbalance produced by AAI during trauma is of critical relevance for a significant proportion of injured victims. This review outlines how AAI at the time of hemorrhagic shock not only prevents adequate responses to fluid resuscitation but also impairs the ability of the host to overcome a secondary infection. Moreover, it discusses the neuroendocrine mechanisms underlying alcohol-induced hemodynamic dysregulation and its relevance to host defense restoration of homeostasis after injury.

The effectiveness of brief intervention among injured patients with alcohol dependence: who benefits from brief interventions?

BACKGROUND

Research investigating the differential effectiveness of Brief Motivational Interventions (BMIs) among alcohol-dependent and non-dependent patients in the medical setting is limited. Clinical guidelines suggest that BMI is most appropriate for patients with less severe alcohol problems. As a result, most studies evaluating the effectiveness of BMI have excluded patients with an indication of alcohol dependence.

METHODS

A randomized controlled trial of brief intervention in the trauma care setting comparing BMI to treatment as usual plus assessment (TAU+) was conducted. Alcohol dependence status was determined for 1336 patients using DSM-IV diagnostic criteria. The differential effectiveness of BMI among alcohol-dependent and non-dependent patients was determined with regard to volume per week, maximum amount consumed, percent days abstinent, alcohol problems at 6 and 12 months follow-up. In addition, the effect of BMI on dependence status at 6 and 12 months was determined.

RESULTS

There was a consistent interaction between BMI and alcohol dependence status, which indicated significantly higher reductions in volume per week at 6 and 12 months follow-up (beta=-.56, p=.03, beta=-.63, p=.02, respectively), maximum amount at 6 months (beta=-.31, p=.04), and significant decreases in percent days abstinent at 12 months (beta=.11, p=.007) and alcohol problems at 12 months (beta=-2.7, p(12)=.04) among patients with alcohol dependence receiving BMI. In addition, patients with alcohol dependence at baseline that received BMI were .59 (95% CI=.39-.91) times less likely to meet criteria for alcohol dependence at six months.

CONCLUSIONS

These findings suggest that BMI is more beneficial among patients with alcohol dependence who screen positive for an alcohol-related injury.

Measuring alcohol-related consequences in school surveys: alcohol-attributable consequences or consequences with students' alcohol attribution

In alcohol epidemiology surveys, there is a tradition of measuring alcohol-related consequences using respondents' attribution of alcohol as the cause. The authors aimed to compare the prevalence and frequency of self-attributed consequences to consequences without self-attribution using alcohol-attributable fractions (AAF). In 2007, a total of 7,174 Swiss school students aged 13-16 years reported the numbers of 6 alcohol-related adverse consequences (e.g., fights, injuries) they had incurred in the past 12 months. Consequences were measured with and without attribution of alcohol as the cause. The alcohol-use measures were frequency and volume of drinking in the past 12 months and number of risky single-occasion (> or =5 drinks) drinking episodes in the past 30 days. Attributable fractions were derived from logistic (> or =1 incident) and Poisson (number of incidents) regression analyses. Although relative risk estimates were higher when alcohol-attributed consequences were compared with nonattributed consequences, the use of AAFs resulted in more alcohol-related consequences (10,422 self-attributed consequences vs. 24,520 nonattributed consequences determined by means of AAFs). The likelihood of underreporting was higher among drinkers with intermediate frequencies than among either rare drinkers or frequent drinkers. Therefore, the extent of alcohol-related adverse consequences among adolescents may be underestimated when using self-attributed consequences, because of differential attribution processes, especially among infrequent drinkers.

Ethnic differences in drinking outcomes following a brief alcohol intervention in the trauma care setting

BACKGROUND

Evidence suggests that brief interventions in the trauma care setting reduce drinking, subsequent injury and driving under the influence (DUI) arrest. However, evidence on the effectiveness of these interventions in ethnic minority groups is lacking. The current study evaluates the efficacy of brief intervention among whites, blacks and Hispanics in the United States.

METHODS

We conducted a two-group parallel randomized trial comparing brief motivational intervention (BMI) and treatment as usual with assessment (TAU+) to evaluate treatment differences in drinking patterns by ethnicity. Patients were recruited from a level 1 urban trauma center over a 2-year period. The study included 1493 trauma patients, including 668 whites, 288 blacks and 537 Hispanics. Hierarchical linear modeling was used to evaluate ethnic differences in drinking outcomes including volume per week, maximum amount consumed in 1 day, percentage days abstinent and percentage days heavy drinking at 6- and 12-month follow-up. Analyses controlled for age, gender, employment status, marital status, prior alcohol treatment, type of injury and injury severity. Special emphasis was given to potential ethnic differences by testing the interaction between ethnicity and BMI.

RESULTS

At 6- and 12-month follow-up, BMI significantly reduced maximum amount consumed in 1 day (P < 0.001; P < 0.001, respectively) and percentage days heavy drinking (P < 0.05; P < 0.05, respectively) among Hispanics. Hispanics in the BMI group also reduced average volume per week at 12-month follow-up (chi(2) = 6.8, df = 1, P < 0.01). In addition, Hispanics in TAU+ reduced maximum amount consumed at 6- and 12-month follow-up (P < 0.001; P < 0.001) and volume per week at 12-month follow-up (P < 0.001). Whites and blacks in both BMI and TAU+ reduced volume per week and percentage days heavy drinking at 12-month follow-up (P < 0.001; P < 0.01, respectively) and decreased maximum amount at 6- (P < 0.001) and 12-month follow-up (P < 0.001). All three ethnic groups In both BMI and TAU+ reduced volume per week at 6-month follow-up (P < 0.001) and percentage days abstinent at 6- (P < 0.001) and 12-month follow-up (P < 0.001).

CONCLUSIONS

All three ethnic groups evidenced reductions in drinking at 6- and 12-month follow-up independent of treatment assignment. Among Hispanics, BMI reduced alcohol intake significantly as measured by average volume per week, percentage days heavy drinking and maximum amount consumed in 1 day.

Effectiveness and cost-effectiveness of policies and programmes to reduce the harm caused by alcohol

This paper reviews the evidence for the effectiveness and cost-effectiveness of policies and programmes to reduce the harm caused by alcohol, in the areas of education and information, the health sector, community action, driving while under the influence of alcohol (drink-driving), availability, marketing, pricing, harm reduction, and illegally and informally produced alcohol. Systematic reviews and meta-analyses show that policies regulating the environment in which alcohol is marketed (particularly its price and availability) are effective in reducing alcohol-related harm. Enforced legislative measures to reduce drink-driving and individually directed interventions to already at-risk drinkers are also effective. However, school-based education does not reduce alcohol-related harm, although public information and education-type programmes have a role in providing information and in increasing attention and acceptance of alcohol on political and public agendas. Making alcohol more expensive and less available, and banning alcohol advertising, are highly cost-effective strategies to reduce harm. In settings with high amounts of unrecorded production and consumption, increasing the proportion of alcohol that is taxed could be a more effective pricing policy than a simple increase in tax.

Retail sales of alcohol and the risk of being a victim of assault

Russell Bennetts and Rachel Seabrook discuss the implications of a new case-crossover study that links retail alcohol sales and violent assaults.

Alcohol-related adverse consequences: cross-cultural variations in attribution process among young adults

BACKGROUND

Social norms around what is culturally accepted in terms of alcohol consumption and drunken comportment appear important regarding the acceptance of alcohol-related adverse consequences; however, investigations often neglect to consider differences in terms of attribution. This study aims at assessing cross-cultural differences in the reporting of alcohol-related adverse consequences. It also considers differences across consequences that might explain which type of consequences (mainly acute or mainly chronic) are most affected by an attribution process.

METHODS

Conditional regression models were estimated based on data from eight European countries participating in the Gender, Alcohol and Culture--An International Study (GENACIS) project. Cases were matched to controls based on usual drinking patterns in order to control for average volume of alcohol and frequency of 'risky single occasion drinking' (RSOD).

RESULTS

Differences among the patterns of associations between countries and consequences were evident. The distinction between Nordic and other European countries was persistent. A higher variability of associations was observed for some consequences, namely the mainly acute instances. Finally, the Isle of Man and Switzerland showed specific trends with associations across consequences.

CONCLUSION

Reporting of alcohol-related adverse consequences seemed strongly affected by cultural norms. The latter may be exemplified by viewing drinking as 'time-out' behaviour. Respondents in countries with a stereotypical history of being 'dry' or with a stereotyped 'binge' drinking culture were more likely to attribute consequences to their alcohol consumption than people in 'wet' countries. This was particularly true for consequences that related to episodic 'time-out' heavy drinking.

Linking drinking to injury--causal attribution of injury to alcohol intake among patients in a Swedish emergency room

This study analysed the drinking patterns and motivation to change drinking behaviours among injury patients who acknowledged alcohol as a factor in their injuries. A cross-sectional study was conducted over 18 months at a Swedish emergency department. A total of 1930 injury patients aged 18 - 70 years were enrolled in the study (76.8% completion rate). Of those who reported drinking, 10% acknowledged alcohol as a factor in their injury. A patient was more likely to report a causal attribution of the injury to alcohol the higher the weekly intake and the higher the frequency of heavy episodic drinking. The motivation to change variables showed a similar pattern of increased likelihood of attributing a causal link of alcohol and injury with increasing discontent with drinking behaviours and increasing desire to change drinking behaviours. The findings suggest that the ability to measure causal attribution of alcohol to injuries could be a promising tool to help patients explore the association between their injuries and alcohol use and motivate patients to modify drinking behaviours in order to avoid future injuries.

Correlates of injury among ED visits: effects of alcohol, risk perception, impulsivity, and sensation seeking behaviors

This cross-sectional study used a random sample of 412 Emergency Department (ED) patients to test the following hypothesizes: 1) injury would be positively associated with problem drinking and recent drinking; 2) impulsivity and sensation seeking would be positively associated with injury, while risk perception would be negatively associated with injury. Results show recent drinking is associated with 2-fold increase in the odds of injury [OR and 95%; CI = 2.34 (1.07-5.10)] while problem drinking and personality factors were unrelated to injury. Other significant predictors were gender and age. Findings suggest a need for alcohol screening for patients who check themselves into the ED due to injury.

Injury severity: role of alcohol, substance use and risk-taking

OBJECTIVE

The objective of the present study was to quantify the relationship between acute alcohol consumption and injury severity.

METHODS

A cross-sectional study was conducted at the Gold Coast Hospital, Gold Coast, Queensland, Australia between October 2000 and October 2001. Data were collected from a systematic sample of patients greater than 15 years of age who presented to the ED for treatment of an injury sustained less than 24 h prior to presentation. Study participants were interviewed face to face on-site. Information obtained included: demographics details; situational variables relative to time of injury (i.e. location, activity and companions at time of injury); self-reported alcohol consumption in the 6 and 24 h prior to time of injury; usual alcohol consumption patterns; self-reported substance use in the 6 and 24 h prior to time of injury; and risk-taking behaviour. Injury severity was coded from patient medical records using the New Injury Severity Score.

RESULTS

Of 789 eligible patients presenting during the study periods, 593 were interviewed (75.2%). Patients who reported drinking above low-risk levels (odds ratio [OR] = 3.35; 95% confidence interval [CI] 1.2-9.6) or who drank beer (OR = 3.54; 95% CI 1.1-11.1) in 6 h prior to injury were significantly more likely to sustain serious than minor injury. Drinking setting and usual drinking patterns were not significantly associated with injury severity, either in crude analyses, or after adjusting for relevant variables.

CONCLUSION

The results of the present study support the conclusion that among injured patients who presented for treatment at a large metropolitan ED, although acute alcohol consumption does not appear to be associated with minor or moderate injury, there is some evidence to suggest that acute alcohol consumption is associated with serious injury.

Usual drinking patterns and non-fatal injury among patients seeking emergency care

OBJECTIVES

To explore the association between drinking patterns, irrespective of whether alcohol was consumed in the event of the injury or not, and different injury variables; and to identify settings and situations in which risky drinkers have an increased likelihood of injury.

STUDY DESIGN

The study population consisted of all patients aged 18-70 years registered for an injury according to ICD-10 at a Swedish emergency department during an 18-month period. After informed consent, the injury patients were screened for drinking habits by the AUDIT-C questionnaire. The gender, age and drinking pattern of injury patients were compared with the general population.

METHODS

A total of 2782 patients aged 18-70 years were registered for an injury during the study period. The number of drop-outs was 631. Drop-outs include those who did not consent to participate, were severely injured, too intoxicated or did not fill out the questionnaire satisfactory. Thus, 77.3% of the target group were included for further analysis (1944 drinkers and 207 abstainers). The patients were categorized into three drinking categories: abstainers, non-risky and risky drinkers. Risky drinkers were defined according to usual weekly consumption of 80g or more of alcohol for women and 110g or more for men and/or heavy episodic drinking (i.e. having six glasses or more one glass=12g alcohol), or both, on one occasion at least once a month, valid for both women and men. To estimate the relationship between drinking patterns and the injury variables (environment, cause of injury, activity and diagnosis), odds ratios (OR) were calculated by logistic regression. Multiple logistic regression was used in order to control for age and sex differences between the various drinking and injury categories.

RESULTS

The proportion of risky drinkers was higher in the study population compared with the general population in the same area. When controlling for age and sex, risky drinkers (OR 6.4(adj) Confidence interval CI 1.9-21.2) and non-risky drinkers (OR .4.5(adj) CI 1.4-14.5) displayed an increased risk for injury compared with abstainers, in amusement locations, parks, by or on lakes or seas, especially while engaged in play, hobby or other leisure activities (risky drinkers: OR 2.8(adj) CI 1.3-5.6; non-risky drinkers: OR 2.4(adj) CI 1.2-4.6). All differences between drinking patterns in external cause of injury disappeared when age and sex were considered. During rest, meals and attending to personal hygiene, the non-risky drinkers had a lower probability of injury compared with abstainers (OR 0.3(adj) CI 0.1-0.8). Non-risky drinkers had a higher probability than abstainers of suffering luxation (dislocation) or distortion (OR 1.6(adj) CI 1.1-2.5). Nine per cent of the study population reported that they believed that their injury was related to intake of alcohol. Half of this group were non-risky drinkers (CI for the 13.7% difference was 9.7-17.6).

CONCLUSIONS

Few significant associations between drinking pattern and injury remained when age and sex were controlled for.

Multi-level analysis of causal attribution of injury to alcohol and modifying effects: Data from two international emergency room projects

Although alcohol consumption and injury has received a great deal of attention in the literature, less is known about patient's causal attribution of the injury event to their drinking or factors which modify attribution. Hierarchical linear modeling is used to analyze the relationships of the volume of alcohol consumed prior to injury and feeling drunk at the time of the event with causal attribution, as well as the association of aggregate individual-level and socio-cultural variables on these relationships. Data analyzed are from 1955 ER patients who reported drinking prior to injury included in 35 ERs from 24 studies covering 15 countries from the combined Emergency Room Collaborative Alcohol Analysis Project (ERCAAP) and the WHO Collaborative Study on Alcohol and Injuries. Half of those patients drinking prior to injury attributed a causal association of their injury with alcohol consumption, but the rate of causal attribution varied significantly across studies. When controlling for gender and age, the volume of alcohol consumed and feeling drunk (controlling for volume) were both significantly predictive of attribution and this did not vary across studies. Those who drink at least weekly were less likely to attribute causality at a low volume level, but more likely at high volume levels than less frequent drinkers. Attribution of causality was also less likely at low volume levels in those societies with low detrimental drinking patterns, but more likely at high volume levels or when feeling drunk compared to societies with high detrimental drinking patterns. These findings have important implications for brief intervention in the ER if motivation to change drinking behavior is greater among those attributing a causal association of their drinking with injury.

Alcohol-Attributable Injuries in Admissions to a Swiss Emergency Room-An Analysis of the Link Between Volume of Drinking, Drinking Patterns, and Preattendance Drinking

BACKGROUND

An association between alcohol consumption and injury is clearly established from volume of drinking, heavy episodic drinking (HED), and consumption before injury. Little is known, however, about how their interaction raises risk of injury and what combination of factors carries the highest risk. This study explores which of 11 specified groups of drinkers (a) are at high risk and (b) contribute most to alcohol-attributable injuries.

METHODS

In all, 8,736 patients, of whom 5,077 were injured, admitted to the surgical ward of the emergency department of Lausanne University Hospital between January 1, 2003, and June 30, 2004, were screened for alcohol use. Eleven groups were constructed on the basis of usual patterns of intake and preattendance drinking. Odds ratios (ORs) comparing injured and noninjured were derived, and alcohol-attributable fractions of injuries were calculated from ORs and prevalence of exposure groups.

RESULTS

Risk of injury increased with volume of drinking, HED, and preattendance drinking. For both sexes, the highest risk was associated with low intake, HED, and 4 (women), 5 (men), or more drinks before injury. At the same level of preattendance drinking, high-volume drinkers were at lower risk than low-volume drinkers. In women, the group of low-risk non-HED drinkers taking fewer than 4 drinks suffered 47.5% of the alcohol-attributable injuries in contrast to only 20.4% for men. Low-volume male drinkers with HED had more alcohol-attributable injuries than that of low-volume female drinkers with HED (46.9% vs 23.2%).

CONCLUSIONS

Although all groups of drinkers are at increased risk of alcohol-related injury, those who usually drink little but on occasion heavily are at particular risk. The lower risk of chronic heavy drinkers may be due to higher tolerance of alcohol. Prevention should thus target heavy-drinking occasions. Low-volume drinking women without HED and with only little preattendance drinking experienced a high proportion of injuries; such women would be well advised to drink very little or to take other special precautions in risky circumstances.

Alcohol use disorder symptoms and risk-taking behavior as predictors of alcohol-related medical events among young adults treated in emergency departments

BACKGROUND

Studies of alcohol-positive patients in emergency departments are not clear on the relationship between alcohol use disorder (AUD) symptoms and risk for injury.

METHOD

Two-hundred three young adults (118 males (58%); mean age = 19.4 years) who were treated in two Level-1 emergency departments (ED) received comprehensive psychiatric interviews and completed the Alcohol Use Disorders Identification Test (AUDIT) and the Cognitive Appraisal of Risky Events (CARE).

RESULTS

Males diagnosed with the AUD symptom of "drinking more or over a longer period than intended" are at greatest risk for requiring emergency care for an alcohol-related medical problem (OR = 10.8, 95% CI = 1.2,94.3, p < .04). Risk-taking behaviors increase risk for an alcohol-related medical event for both genders (OR = 2.6, 95% CI=1.1,5.6.1, p < .03). Alcohol use disorder severity related negatively to risk for experiencing an alcohol-related medical problem (OR = 0.6, 95% CI = 0.4,0.9, p < .04).

CONCLUSIONS

Young adults treated for alcohol-related medical problems often exhibit DSM-IV defined symptoms of AUD and are engaging in risk-taking behaviors and should be referred for an in-depth assessment of alcohol use disorders and risk-taking activities.