Table 3. Odds ratio (OR) and 95%CI of short sleep duration according to sociodemographic variables, health problems, and well-being. Campinas, State of São Paulo, Brazil, 2014–2015.

Variable		≤ 6 hours
		Stage 1a		Stage 2b		Stage 3c
		OR	95%CI	OR	95%CI	OR	95%CI
Sex
	Female	1		1		1
	Male	1.39	1.05–1.85	1.57	1.16–2.13	1.54	1.13–2.09
Age (years)
	20 to 39	1		1		1
	40 to 59	1.43	1.04–1.96	1.28	0.93–1.78	1.31	0.95–1.82
	60 or more	1.00	0.75–1.33	0.85	0.62–1.18	0.86	0.62–1.19
Schooling (years)
	0 to 3	1		1		1
	4 to 8	1.15	0.74–1.81	1.07	0.69–1.65	1.11	0.73–1.71
	9 to 11	1.42	0.84–2.42	1.36	0.80–2.33	1.45	0.87–2.44
	12 or more	1.73	1.08–2.75	1.60	0.98–2.62	1.77	1.10–2.84
Number of chronic diseases
	None			1		1
	One			1.47	1.02–2.12	1.47	1.00–2.17
	Two			1.73	1.07–2.80	1.75	1.08–2.84
	Three or more			1.62	1.16–2.28	1.59	1.11–2.29
Number of health problems
	None			1		1
	One or two			1.36	1.00–1.84	1.52	1.05–2.22
	Three or more			1.96	1.22–3.17	1.75	1.03–2.96
Time of happiness (last 4 weeks)
	Always/Most of the time					1
	Some of the time					0.81	0.53–1.23
	Hardly ever or never					2.41	1.51–3.87

^aMultinomial regression model analyzing all socioeconomic and demographic variables with p < 0.20 in bivariate analysis.

^bMultinomial regression model adjusted for sociodemographic variables.

^cMultinomial regression model adjusted for all variables of the table.