Table 3 -. Gross and adjusted association between the length of napping during the night shift and the recovery after work for nurses who participated in the Health Study of Nurses (n=1940). Rio de Janeiro, RJ, Brazil, 2010-2011.

Length of napping	Model 1	Model 2	Model 3
	Gross OR	Adjusted OR*	Adjusted OR†
	(95%CI)	(95%CI)	(95%CI)
Does not sleep	1	1	1
Sleeps up to 2 hours	1.44 (1.07-1.93)	1.42 (1.05-1.90)	1.33 (0.98-1.81)
Sleeps between 2.1 and 3 hours	2.27 (1.71-3.00)	2.20 (1.65-2.93)	1.79 (1.33-2.41)
Sleeps more than 3.1 hours	1.66 (1.06-2.60)	1.91 (1.21-3.02)	1.50 (0.94-2.40)

^*Adjusted for sex, age, marital situation and per capita income.

^†Additionally adjusted for alcohol consumption, complaints of insomnia, physical exercise and domestic burden.