Table 2.

Multivariate robust Poisson regression models for the association between working conditions and the comorbidity of musculoskeletal disorders and depression among nurses (n=397)

Predictors	Model 1		Model 2
	PR	95%CI	PR	95%CI
Work-family conflict	2.51**	1.63–3.85	2.18**	1.33–3.58
Physical demands	1.02	0.93–1.12	0.99	0.89–1.09
Psychological demands	0.98	0.84–1.14	0.98	0.85–1.13
Job control	0.90	0.75–1.08	0.90	0.75–1.07
Social support	0.93	0.80–1.09	0.96	0.81–1.13
Shift work
8-hour day			1.00
8-hour evening			0.66	0.20–2.20
8-hour night			2.77*	1.22–6.31
12-hour day			2.20*	1.07–4.50
12-hour evening			1.56	0.45–5.45
12-hour night			1.86	0.83–4.18

Note.

^*p<0.05

^**p<0.01.

Model 2 was also adjusted for age, gender, race, BMI, and regular exercise, which were not associated with the comorbidity.