Table 1.

Demographic and polysomnographic data for participants

	Pre-Adenotonsillectomy N=144 No. (%), Median [Q1, Q3], or Mean ± SD	Post-Adenotonsillectomy N=137 No. (%), Median [Q1, Q3], or Mean ± SD	P *
Age (yrs)	7.1 ± 2.5	7.8 ± 2.5	NA
Male gender	81 (56%)	76 (55%)	NA
Body Mass Index z-score	0.63 ±1.31	0.84 ±1.05	<.0001 a
Socioeconomic class (at baseline only)	2.0 [2.0, 3.0]	NA	NA
Total Recording Time (TRT, min)	601 ± 38	607 ± 42	.17 a
Total Sleep Time (TST, min)	526 ± 51	540 ± 54	.0061 a
Sleep Efficiency (TST*100/TRT)	88 ± 7	89 ± 7	.025 a
Arousal index (events/hr of sleep)	11.1 [8.5, 14.4]	9.5 [7.8, 11.2]	<.0001 b
% Stage N1	12 ± 8	10 ± 3	.0001 a
% Stage N2	44 ± 7	47 ± 6	<.0001 a
% Stage N3	25 ± 5	23 ± 6	<.0001 a
% Stage R	19 ± 5	21 ± 4	.0028 a
Respiratory disturbance index (events/hr of sleep)	4.5 [2.0, 9.5]	1.5 [0.8, 2.6]	<.0001 b
Minimum oxygen saturation (%)	92 [89, 94]	93 [91, 94]	<.0001 b
Periodic Leg Movement Index (PLMI)	0.0 [0.0, 1.4]	0.4 [0.0, 2.0]	.010 b
Periodic Leg Movement Arousal Index (PLMAI)	0.0 [0.0, 0.1]	0.0 [0.0, 0.4]	.0014 b
Periodic Leg Movement Index ≥5	15 (10%)	21 (15%)	.0067 c
Periodic Leg Movement Arousal Index ≥1	10 (7%)	18 (13%)	.0075 c

^*for change after adenotonsillectomy, among those subjects who had follow-up assessments

^apaired T test

^bWilcoxon signed rank test

^cMcNemar’s Test