Table II. F-ratios and P-values for analyses of effects of reproductive status (RS: menstrual vs pregnant vs postpartum vs menopausal) and age category (19-27, 28-36, 37-45, 46+) on polysomnographic (PSG) variables, covariate adjustment was applied when the covariate (age, for reproductive status; reproductive status, for age category) was significant at P<. 10. Significant effects (P<.05) are highlighted in bold. * Results of analyses with covariate, where the P-value of the age covariate was P<.10. + Results of analyses with covariate, where the P-value of the RS covariate was P<.10.

Effect of →	Reproductive status		Age category
PSG variable	F(3,130)	P	F(3,130)	P
Total sleep time	0.092*	.985*	5.511	.001
Sleep efficiency	3.146	.027	2.401	.071
Sleep latency	2.832	.041	2.905+	.037+
Wake after sleep onset	2.338*	.077*	1.258+	.292
Stage 1 %	4.074	.008	2.482	.064
Stage 2 %	0.885*	.451*	3.450+	.019+
Stage 3 %	7.930	.0001	7.203+	.001+
Stage 4 %	2.055*	.109*	8.592+	.0001+
Slow-wave sleep %	4.838*	.003*	9.386+	.0001+
REM %	1.364	.257	1.771	.156
REM latency	.0460	.711	0.257	.856
REM density	3.404*	.020*	1.766	.157