Table 2.

Poisson regression models predicting short sleep duration and poor sleep quality among nursing assistants.

Predictors	Short sleep duration				Poor sleep quality
	Model 1		Model 2		Model 1		Model 2
	PR	95% CI	PR	95% CI	PR	95% CI	PR	95% CI
Gender (male)	1.18	0.83–1.68	1.15	0.78–1.69	1.84*	1.04–3.26	1.82*	1.03–3.22
Race
White (ref)	1.00		1.00		1.00		1.00
Black	0.81*	0.66–0.99	0.78*	0.63–0.95	0.62*	0.43–0.89	0.71a	0.50–1.01
Others	1.13	0.82–1.56	1.23	0.90–1.67	0.44	0.14–1.34	0.82	0.38–1.76
Children	1.19a	0.97–1.46	1.16	0.95–1.41	1.07	0.75–1.53	1.17	0.84–1.65
Dependents	1.22a	0.98–1.51	1.26*	1.02–1.56	1.14	0.74–1.78	1.25	0.83–1.87
Smoking	1.09	0.89–1.33	1.12	0.92–1.37	1.38a	0.95–1.98	1.27	0.89–1.81
MSDs	1.16	0.96–1.41	1.11	0.91–1.35	1.57*	1.09–2.26	1.44*	1.02–2.04
Shift work
Day (ref)	1.00		1.00		1.00		1.00
Evening	0.88	0.67–1.16	0.91	0.69–1.20	0.82	0.51–1.31	0.89	0.55–1.42
Night	1.57**	1.26–1.96	1.57**	1.26–1.95	1.01	0.59–1.74	1.08	0.67–1.74
Rotating	1.09	0.82–1.44	0.95	0.69–1.29	1.04	0.64–1.68	0.97	0.59–1.58
Shift length	1.01	0.96–1.06	1.02	0.97–1.08	1.07a	0.99–1.15	1.07a	0.99–1.15
Other jobs	1.40**	1.14–1.72	1.47**	1.18–1.82	0.97	0.62–1.53	0.94	0.60–1.48
WCI			0.93**	0.88–0.98			0.83**	0.76–0.90

WCI = Working Condition Index; PR = Prevalence ratio.

^ap < 0.10;

^*p < 0.05;

^**p < 0.01.

Variables not included in either Model 1 (p > 0.10 for both outcomes): age, marital status, education, sedentary behavior, BMI, chronic health conditions, and weekly work hours.