Table 1.

Population characteristics stratified by sex.

Variable	Total (n = 54)	Male (n = 27)	Female (n = 27)
	Mean ± SD (% of n)	Mean ± SD (% of n)	Mean ± SD (% of n)	p-Value
Age (mean)	36.0 ± 14.4	38.3 ± 14.7	33.7 ± 13.9	0.241
Reported use of sleep medication	9 (16.7%)	2 (7.4%)	7 (25.9%)	0.085
Heart conditions	1 (1.9%)	1 (3.7%)	0 (0%)	0.997
Respiratory conditions	7 (13.0%)	4 (14.8%)	3 (11.1%)	0.191
Global PSQI (mean)	5.0 ± 2.3	4.3 ± 2.3	5.2 ± 2.2	0.002

Note: subjects were excluded if they were taking heart medications, had a pacemaker, or severe sleep apnea (see Section 2). Heart and respiratory conditions listed here included chronic asthma, sleep apnea (AHI < 30), and arrhythmia. The p-value indicates whether there was a statistical difference between men and women; bolded values indicate a statistical difference at p < 0.05.