Fig. 1

Diurnal pattern of cortisol secretion at follow-up according to shift work at baseline. (Solid line represents cortisol pattern at follow-up for physicians with shift work status “no” at baseline (N = 51); dashed line represents cortisol pattern at follow-up for physicians with shift work status “yes” at baseline (N = 19); Error bars represent standard errors of adjusted means (ng/ml) of four time points cortisol levels at follow-up)