TABLE 4.

Heart rate variability in frequency band 0 – 0.15 Hz $\frac{{(\mathit{seconds}\mathit{RMS})}^2}{Hz}$ (mean ± SE), before, during, and after hot flashes during waking and Stage 1 sleep

Waking
Period	Mean	N	SE
Beforea,b	2.20	7	0.28
Duringa	1.11	29	0.15
Afterb	0.74	11	0.23

Stage 1
Period	Mean	N	SE
Before	1.01	3	0.41
Duringa	1.97	7	0.36
Aftera	1.00	7	0.35

^aSignificantly different from each other, P < 0.003, planned comparison with Bonferroni correction for degrees-of-freedom.

^bSignificantly different from each other, P < 0.001, planned comparison with Bonferroni correction for degrees-of-freedom.

^aSignificantly different from each other, P < 0.03, planned comparison with Bonferroni correction for degrees-of-freedom.

N = number of observations.