Job strain among post office mailhandlers.

A sample of 4,018 U.S. Post Office mailhandlers nationwide completed a questionnaire assessing job demands, decision latitude, hazardous conditions, supervisory support, physical exertion, physical/psychological strain, sleeping problems, muscle strain, and job dissatisfaction. Scales were obtained from Karasek's Job Content Questionnaire. Comparative data were available from the U.S. Quality of Employment Surveys (for "mail carriers and handlers") and two samples of contemporary working populations. Hierarchical multiple regressions controlled for age, sex, education, length of postal service, Vietnam veteran status, and marital status. Mailhandlers reported significantly higher levels of negative job characteristics than both the national and contemporary samples, and their levels of job demands and decision latitude place them in the "high strain" quadrant of Karasek's model. Women not only reported higher strain, job dissatisfaction, and sleeping problems than men, but also higher levels of negative job characteristics. While other demographic variables, particularly Vietnam veteran status, were associated with stress-related outcomes, structural aspects of the work environment were more strongly associated with outcome. The authors conclude that postal mailhandlers face a highly stressful work environment.