“…The JCQ subscales have demonstrated good validity and acceptable reliability in large study populations from six countries (Karasek et al., ). The reliabilities (Cronbach's alpha) of these subscales were .85 (physical demands), .63 (psychological demands), .56 (decision authority) and .75 (social support) for this study sample, which were similar to their reliabilities reported in a previous study with nursing assistants (Zhang, Punnett, Phillips McEnany, & Gore, ). Participants’ usual work shift was collected, and choices were 8 hr day, 8 hr evening, 8 hr night, 12 hr day, 12 hr evening (including work schedules of 9 a.m.–9 p.m. 11 a.m.–11 p.m. and 12 p.m.–12 a.m.) and 12 hr night shifts.…”