Validation of alternative formulations of job strain.
OBJECTIVE
To examine the construct validity of different formulations of job strain based on the demand-control(-support) model in the context of a hospital-based survey.


METHODS
We defined the best measure of job strain as the one that would be better predicted by professional status and job characteristics and better predict health outcomes, stress and back-pain leave. We received 1,298 responses from collaborators at the University Hospitals of Geneva who responded to a questionnaire survey including all the constructs cited above and the Job Content Questionnaire.


RESULTS
The difference between decision latitude and psychological demands (strain by subtraction), corresponded to the definition of the best measure of job strain and significantly, albeit weakly, predicted all outcomes. The logarithmic approach was the second best measure of job strain and was in fact a better predictor of stress.


CONCLUSIONS
We would encourage researchers to explore different formulations of job strain, in particular the subtraction approach, to compute strain from demands and decision latitude.
Courvoisier
Delphine S
DS
Clinical Epidemiology Division, Geneva University Hospitals, Geneva, Switzerland. Delphine.Courvoisier@hcuge.ch
Perneger
Thomas V
TV
D000328:Adult; D004651:Employment / Q000523:psychology*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010564:Personnel, Hospital / Q000523:psychology; D013315:Stress, Psychological / Q000175:diagnosis*; D011795:Surveys and Questionnaires / Q000592:standards*; D013557:Switzerland