Table 3. Change from 8-hour shift system to 12-hour shift system and wellbeing and perceived effects of shift work arrangements. Odds ratios (OR) with 95% confidence intervals in the GEE models with those who stayed in 8-hour shift system as the reference group.

	OR	95%CI	p-value
Subjective health	1.297	0.757–2.223	0.343
Work ability	1.073	0.646–1.782	0.785
Need for Recovery from Work (NFR)	0.748	0.412–1.359	0.341
Satisfied with current shift system	2.640	1.486–4.689	0.001
Perceived negative effects of current shift system on:
Sleep and alertness	0.417	0.252–0.689	0.001
Work-life balance	0.299	0.178–0.504	<0.001
Fluency of work	0.723	0.391–1.338	0.302
Commuting	0.804	0.435–1.794	0.734

*Disturbs to some extent or a lot. GEE analyses adjusted with age, sex and baseline 8-hour shift system (fast vs. slow forward-rotating)