Table 2.

P-values from two-way repeated measures anova on HRV indices after adjusting for age and BMI (statistically significant postulated relationships in bold)

	Men (n = 221)			Women (n = 67)
Indices	RDI	SS	Interaction	RDI	SS	Interaction
LHR	0.910	< 0.001	0.322	0.636	< 0.001	0.126
LHRra	0.823	< 0.001	0.466	0.503	< 0.001	0.244
HFP	0.098	< 0.001	0.039	0.577	< 0.001	0.397
HFPra	0.070	0.005	0.018	0.647	< 0.001	0.465
mRRI	< 0.001	< 0.001	0.198	0.317	< 0.001	0.958

HRV, heart rate variability; RDI, respiratory disturbance index; HFP, high-frequency power; mRRI, mean R-R interval; LHR, low-to-high frequency ratio; SS, sleep-wake state; HFPra, HFP respiration-adjusted counterparts; LHRra LFP respiration-adjusted counterparts; R, REM; W, wakefulness; BMI, body mass index. There are four levels (0–5, 5–15, 15–30, 30+) of RDI and five repeated levels (R, W, S1, S2, S3) of SS.