Predictors of work disability in rheumatoid arthritis patients. A five-year followup

Costs and predictors of costs in rheumatoid arthritis: a prevalence-based study

OBJECTIVE

To analyze the annual cost of rheumatoid arthritis (RA) and its predictive factors.

METHODS

Data were obtained from a 12-month retrospective cohort of 201 RA patients, randomly selected from a rheumatology registry, through a structured interview and records of the Central Information System of the hospital. Results were divided into direct, indirect, and total costs in 2001 US dollars. A sensitivity analysis was performed. Multiple linear regression models for the different types of costs were carried out.

RESULTS

The total cost was US dollars 2.2 million per year, with a cost attributable to RA of US dollars 2.07 million per year. The average cost per patient was US dollars 10419 per year (ranging from US dollars 7914 per patient per year in the best scenario to US dollars 12922 per patient per year in the worst case). Direct costs represent nearly 70% of total costs. We found an average increment in total costs of US dollars 11184 per year per unit of Health Assessment Questionnaire (HAQ) score (P < 0.0001) and an average annual increment of US dollars 621 per year of disease (P < 0.0001). After adjustment, the HAQ score, inability to perform housework tasks, and being permanently disabled for work were the only predictors of high costs.

CONCLUSION

Our data show a remarkable economic impact of RA over society and link the costs of the disease to its consequences in terms of functional disability, work disability, and housework disability.

Vocational rehabilitation in patients with chronic rheumatic diseases: a systematic literature review

OBJECTIVE

To describe the effectiveness of vocational rehabilitation programs for patients with chronic rheumatic diseases by means of a systematic review of the literature.

METHODS

Data were obtained by a computer-aided and manual search of the literature from 1980 until May 2001. Vocational rehabilitation programs had to be clearly defined interventions specifically aimed at having patients with rheumatic diseases reenter or remain in the work force. The vocational rehabilitation programs had to be executed by one or more health professionals. Outcome of the intervention had to be described in terms of vocational status (work disability, sick leave, job modification, paid occupation, retraining).

RESULTS

Six studies were identified. All were uncontrolled studies. Follow-up periods ranged 2-84 months. Five of six vocational rehabilitation programs consisted of multidisciplinary intervention and 15% to 69% of the patients successfully returned to work.

CONCLUSIONS

Although 5 of 6 studies showed a marked positive effect of vocational rehabilitation on work status, proof of the benefit of these interventions is limited, mainly due to methodologic differences and shortcomings.

RELEVANCE

Work disability is a major consequence of the disease in patients with rheumatic conditions. More and more attention is being paid to preventing disability and promoting return to work. Knowledge regarding the effectiveness of vocational rehabilitation programs is insufficient. Semin Arthritis Rheum 32:196-203.

Negative social perception of hypothetical workers with rheumatoid arthritis

In the present study, 340 college subjects evaluated the job performance of hypothetical workers of varying health status, to test the hypothesis that workers with rheumatoid arthritis (RA) are more negatively perceived than other workers (paraplegic, healthy) despite equivalence in age, sex, education, job history, and time off from work for medical reasons. Results indicated that workers with RA are perceived as having significantly poorer interpersonal job skills and are deserving of significantly poorer scores for overall job performance, although no differences were obtained in the ratings of their job commitment or job expertise. The suggestion is made that an unfavorable social reaction to RA patients in the workplace is one factor that impairs the development of social support for these patients at work and contributes to their inflated disability rate.

Which patients stop working because of rheumatoid arthritis? Results of five years' follow up in 732 patients from the Early RA Study (ERAS)

OBJECTIVES

To assess the occurrence and prognostic factors for the ability to maintain paid work in patients with rheumatoid arthritis (RA).

SETTING

Inception cohort of patients with RA recruited from rheumatology departments in nine NHS Hospital Trusts in England.

PATIENTS

All consecutive patients with RA of less than two years' duration, before any second line (disease modifying) drug treatment, and followed up for five years.

METHODS

Clinical, laboratory, and radiological assessments, and all treatments were recorded prospectively using a standardised format at presentation and yearly.

OUTCOME MEASURES

Changes in, and loss of paid work by five years' follow up.

RESULTS

732 patients completed the five year follow up. 353/721 (49%) were gainfully employed at the onset of RA, 211 (60%) were still working at five years, 104 (29%) stopped because of the disease, and 31 (9%) retired for reasons other than RA. Work disability at five years was more likely in manual workers (odds ratio (OR) 2.3, 95% confidence interval (CI) 1.4 to 3.8) and worse baseline Health Assessment Questionnaire (HAQ>1.5, OR 2.26, 95% CI 1.38 to 3.7). In combination with other baseline variables (erythrocyte sedimentation rate, sex, age of onset, and radiological erosions), employment outcome was predicted in 78% using multivariate analysis.

CONCLUSIONS

Nearly half of the patients with RA were in paid employment at onset, work disability was an adverse outcome for a third of these patients by five years, and manual work and high baseline HAQ were important predictors for this. These details are likely to be useful to clinicians, health professionals, and patients in order to plan medical, orthopaedic, and remedial treatments in early RA. Future disease modifying treatments could be compared with this cohort of patients who were treated with conventional second line drugs.

Work factors and behavioural coping in relation to withdrawal from the labour force in patients with rheumatoid arthritis

OBJECTIVE

To assess separate and combined effects of work factors and behavioural coping in relation to withdrawal from the labour force among patients with rheumatoid arthritis (RA).

METHODS

A cross sectional study was conducted in a Dutch nationwide random sample of 720 patients with RA. Information about work factors and behavioural coping was collected by a self-administered postal questionnaire. A broad variety of work factors and coping styles were evaluated separately and in combination using multivariate logistic regression analyses, controlling for sociodemographic and disease related variables. Attributable and preventable fractions were calculated from the combined analyses to assess the relative importance of the contributing factors.

RESULTS

Additional job training, equal career opportunities, letting the disease influence the choice of the current job position, and informing colleagues about having the disease were negatively associated with withdrawal from the labour force. The most relevant factor in terms of decreasing the risk was adjusting job demands which accounted for 63% of the patients still in the labour force. Decreasing activities and diverting attention in order to cope with pain, and pacing in order to cope with limitations were the coping styles which were positively associated with withdrawal from the labour force. The most relevant factor in terms of increasing the risk of withdrawal was pacing which accounted for 67% of the withdrawals.

CONCLUSION

Work factors are potentially important modifiable risk factors for withdrawal from the labour force in patients with RA. Behavioural coping is also relevant.

What are the costs to society and the potential benefits from the effective management of early rheumatoid arthritis?

Rheumatoid arthritis is a chronic disabling condition associated with a significant long-term loss of function and a significant socio-economic impact on individual sufferers and their families, as well as on society as a whole. There is a suggestion that the incidence and severity of the disease may be abating slightly, which has been attributed to the trend to 'invert the pyramid' and to diagnose and treat rheumatoid disease earlier and more aggressively. Studies have confirmed that the erosions, which lead to subsequent joint damage, occur early in the course of the disease. Ongoing disease activity, both clinically and serologically, has now been linked to increasing morbidity, loss of function and mortality. New agents have been developed and, together with combinations of old and new agents, have been shown to be more effective if used earlier in the course of the disease. The better the early control of the disease, the better the long-term outcome. Early and more vigorous treatment, particularly of those patients with a high joint count, early loss of function and an elevated titre of inflammatory markers, has potential to reduce the twofold increase in mortality seen among rheumatoid arthritis patients. The scene is set to have a greater impact on the long-term disability and associated cost to the individual and society by treating early and treating often. Combination therapy and the new 'biologicals' are, however, far more expensive than the previously available agents, and the direct medical costs associated with medication, as well as the monitoring costs for rheumatoid arthritis, are increasing. It is difficult to value the long-term prevention of pain and suffering, and the maintenance of productivity. However, if the disease were effectively controlled early, there would be long-term benefits to be offset against the higher treatment cost. It behooves the rheumatological community to use the new agents wisely to gain the greatest advantage for all patients as well as to monitor the long-term benefits and drawbacks so that cost-effectiveness can be comprehensively evaluated.

Employment, work disability, and work days lost in patients with ankylosing spondylitis: a cross sectional study of Dutch patients

OBJECTIVE

To evaluate employment status, work disability, and work days lost in patients with ankylosing spondylitis (AS).

METHODS

A questionnaire was sent to 709 patients with AS aged 16-60. The results of 658 of the patients could be analysed.

RESULTS

After adjustment for age, labour force participation was decreased by 15.4% in male patients and 5.2% in female patients compared with the general Dutch population. Work disability (all causes) was 15.7% and 16.9% higher than expected in the general population for male and female patients respectively. In particular, the proportion of those with a partial work disability pension was increased. Patients with a paid job lost 5.0% of work days as the result of having AS, accounting for a mean of 10.1 days of sick leave due to AS per patient per year in addition to the national average of 12.3 unspecified days of sick leave.

CONCLUSION

This study on work status in AS provides data adjusted for age and sex, and the differences from the reference population were significant. The impact of AS on employment and work disability is considerable. Work status in patients with AS needs more attention as an outcome measure in future research.

Update on work disability in rheumatic diseases

Two recent studies suggest the prevalence of rheumatic condition-related work disability is considerably lower than was suggested in previous studies. However, the samples in the recent studies did not include older workers and included persons who gained employment after disease onset. In other recent studies, the rate of work disability among persons employed at disease onset is still high; a fair amount of work disability occurs in the early years of disease. There is no clear evidence yet that treatment improvements have altered the rates of work disability. Because work characteristics, like level of physical demand, influence risk for work disability and are potentially amenable, other interventions are needed to reduce rheumatic disease-associated work disability. Accommodation provided to alleviate problems in doing work and outside of work activities is the most promising intervention, followed by job/career change. Assessment tools are just now becoming available to help clinicians identify patients in need of assistance.

The impact of passive coping on rheumatoid arthritis pain

OBJECTIVE

To determine the ability of coping to predict pain.

METHODS

Data on 111 rheumatoid arthritis (RA) patients (86 women and 25 men) were gathered from a mail survey. Statistical analyses were conducted on a range of clinical and psychological variables: physical disability, disease duration, pain, depression, helplessness, and passive and active coping. Pain was measured with both the pain subscale of the Arthritis Impact Measurement Scales and a visual analogue scale, and coping was measured with the Vanderbilt Pain Management Inventory.

RESULTS

A series of multiple regression analyses revealed that the optimal predictors of pain in RA were physical disability and passive coping, which accounted for 40% of the variance associated with pain. Path analysis revealed that passive coping mediates between the physical disability and pain, and between physical disability and depression.

CONCLUSION

The results of this study have implications for the overall management of RA. In addition to the medical treatment, the experience of pain and depression in RA should be addressed through an intervention programme designed to enhance coping strategies.

Labour force participation among patients with rheumatoid arthritis

OBJECTIVES

To assess work history and labour force participation among patients with rheumatoid arthritis (RA) in the Netherlands.

METHODS

A random sample of 1056 patients with RA aged 16-59 years from 17 rheumatology practices in the Netherlands was examined. Data on disease status and outcome were obtained by a questionnaire including standardised instruments, such as the Rapid Assessment of Disease Activity in Rheumatology (RADAR) and RAND-36 questionnaires. Labour force participation was defined as having a paid job.

RESULTS

Of the study group with a mean disease duration of 12 years, 35.7% held a paid job (men 56.7%; women 27.7%). When standardised for age, sex, and educational level, the labour force participation of patients with RA was 61.2% compared with 65.5% for the general population, which was not statistically significant. Disease duration of six years and more was negatively associated with labour force participation.

CONCLUSIONS

After controlling for the confounding effects of age, sex, and education, the labour force participation of patients with RA in the Netherlands is only slightly lower than that of the general population.

Disease-modifying anti-rheumatic drug use according to the 'sawtooth' treatment strategy improves the functional outcome in rheumatoid arthritis: results of a long-term follow-up study with review of the literature

OBJECTIVES

To investigate long-term functional outcomes of early rheumatoid arthritis (RA) patients treated actively with disease-modifying anti-rheumatic drugs (DMARDs) from diagnosis, according to the 'sawtooth' principle, and to compare the results to historical data.

METHODS

The surviving 46 and 65 patients from two early RA cohorts were examined on average 13.0 (cohort 1) and 8.5 (cohort 2) yr, respectively, after onset of disease. Functional outcome was measured by the Health Assessment Questionnaire (HAQ) and compared with the HAQ scores of 57 RA patient cohorts found through a Medline computer search.

RESULTS

The respective cross-sectional mean HAQ scores of cohorts 1 and 2 were 0.75 and 0. 55, and were more favourable than the mean HAQ scores of 1.27 (27 cohorts, disease duration >10 yr) and 1.13 (13 cohorts, disease duration 5-10 yr) of the comparator cohorts. The median time that our patients were treated with DMARDs out of the total follow-up period was 88%, while in the majority of comparator cohorts the use of DMARDs was less extensive or poorly described.

CONCLUSIONS

The observation of better preserved function in patients with RA over 13 and 8.5 yr, compared to earlier reports which indicated more severe declines, is a hopeful sign for the rheumatology community.

Rheumatoid arthritis, disability and the workplace

Rheumatoid arthritis is a common cause of disability worldwide. The nature of the disability impacts on all areas of life. This chapter focuses on the nature of the disability of rheumatoid arthritis with emphasis on work disability. The various approaches for minimising the disability and rehabilitating those with disability are discussed. The tools for the assessment of disability are described and their strengths and limitations outlined.

Differences by sex in correlates of work status in rheumatoid arthritis patients

OBJECTIVE

To examine differences by sex in correlates of work status in rheumatoid arthritis (RA) patients seen in rheumatology clinical settings.

METHODS

Associations of demographic factors, occupation, duration of RA, and scores for disease and psychological scales with work status according to sex were examined in a cross-sectional study of 960 RA patients, aged 18-64 years, of whom 451 were working and 254 were work-disabled. Comparisons of characteristics were conducted by logistic regression between working and work-disabled, and between working and not working subjects.

RESULTS

For both men and women, the odds of work disability increased with age, duration of RA, nonwhite race, and scores indicating high levels of functional disability, pain, and helplessness. Work-disabled women were more likely than working women to have less than a high school education or a nonprofessional occupation, compared with little association of these variables with work disability in men. Unmarried men were more likely to be work-disabled than working, while marital status was not associated with work disability in women. Differences by sex in the associations of pain and helplessness scores with work disability were also observed. Similar results were observed in associations of these characteristics when the outcome was coded as working versus not working.

CONCLUSIONS

These findings indicate some differences between men and women with RA in correlates of work disability that may help to more effectively target interventions. A patient's sex should be an important consideration in studies of work disability due to arthritis.

The prognosis of rheumatoid arthritis: assessment of disease activity and disease severity in the clinic

The prognosis of rheumatoid arthritis is best described separately for mortality, work disability, costs, functional disability, total joint arthroplasty, radiographic abnormality, and psychosocial factors. The most important determinants of prognoses are the severity and persistence of disease activity. Methods for disease activity assessment have been developed for use in clinical trials, but these are often not suitable for use in clinical practice because of time constraints, costs, and special training required. However, clinicians can measure disease activity relatively simply according to joint counts, acute-phase reactants, and patient self-report tests. Nomograms, based on percentile ranking of disease activity variables, are simple tools that can be used in the clinic to estimate disease activity and change in clinical status.

Risk factors for early work disability in systemic lupus erythematosus: results from a multicenter study

OBJECTIVE

To study the risk factors for early work disability in systemic lupus erythematosus (SLE).

METHODS

A sample of 159 SLE patients who had been employed at some time since diagnosis was drawn from a multicenter study of outcome in SLE. Disease activity, organ damage, education, income, source of health insurance, and work-related factors were measured in a standardized interview. Work disability was defined by patient self-report of not working because of SLE. The outcome measure was current work status. Seven patients were excluded from the analysis because their choice not to work was unrelated to SLE.

RESULTS

An average of 3.4 years after diagnosis, 40% had quit work completely, and job modification was substantial. Univariate analysis (chi-square and t-test) showed that significant predictors of early work disability included having a high school education or less, receiving Medicaid or having no health insurance, having a job which required more physical strength, having an income below poverty level, and having greater disease activity at diagnosis. In multivariate models, significant predictors were education level (P = 0.0004), higher physical demands of the job (P = 0.0028), and higher disease activity at diagnosis (P = 0.0078). Race, sex, cumulative organ damage at diagnosis, and disease duration were not significant.

CONCLUSION

Early work disability in SLE is strongly associated with some sociodemographic factors that might be amenable to intervention.

Reducing work disability associated with rheumatoid arthritis: identification of additional risk factors and persons likely to benefit from intervention

OBJECTIVE

To study additional risk factors for rheumatoid arthritis (RA)-related work disability and to identify the groups of individuals at high risk and the potentially modifiable factors which place them at risk.

METHODS

A cross-sectional mail survey was conducted among 469 adults with RA. Work disability was defined as unemployment due to RA. A broad range of explanatory factors was examined, including sociodemographic, health, work, support given by others, and commuting difficulty. Employed and work-disabled subjects were compared by t-test and chi-square. Attributable fractions were calculated to assess the predictive value of factors. A recursive partitioning procedure identified individuals at varying risks for work disability, and their characteristics were defined.

RESULTS

The risk factors joint pain and functional status, commuting difficulty, physical demands of the job, and disease duration were important predictors of work disability in both the attributable fraction and recursive partitioning analytic models. Having a professional or administrative job was protective, provided the salary earned was not low. Younger individuals with RA of shorter duration were placed at high risk by potentially modifiable factors. While older persons with RA of long duration were at high risk, modifiable factors could not be identified.

CONCLUSION

Commuting difficulty, a previously overlooked factor, is an important predictor of RA work disability. Younger individuals with RA of relatively short duration can be placed at high risk by potentially modifiable factors including commuting difficulty, physically demanding jobs, greater joint pain and poor functional status, and nonprofessional/non-administrative jobs.