Table 2.

Polysomnogram measures (mean ± standard deviations) for Control and RLS groups

PSG sleep measure	Control	RLS	t, P values
Total sleep time (min)	334.6 ± 55.3	285.4 ± 74.6	3.0, 0.035
PLMS/h	11.8 ± 19.8	61.2 ± 53.9	4.8, 0.001
Sleep onset (min)	10.6 ± 11.9	7.6 ± 9.6	1.1, ns
sleep efficiency %	90.1 ± 7.2	84.7 ± 13.3	2.0, 0.048
WASO (min)	36.8 ± 27.1	44.9 ± 37.1	1.0, ns
N1%	7.7 ± 4.0	11.9 ± 13.9	1.6, 0.111
N2%	53.2 ± 11.1	48.1 ± 11.3	1.8, 0.068
N3%	15.5 ± 10.5	14.9 ± 12.2	0.2, ns
REM%	23.6 ± 8.4	25.1 ± 9.7	0.7, ns

WASO, wake after sleep onset; N1%, percent of stage 1 NREM sleep; N2%, percent of stage 2 NREM sleep; N3%, percent of stage 3/4 NREM sleep). The corresponding t-test score, (t) and probability, (P) value for control versus RLS group comparison for the individual PSG values are in the far right column. ns = P > 0.2.