Table 2.

Sleep Variables by Initial Vitamin Grouping

	No Vitamin		Multivitamin		Single Vitamin		Multiple Vitamins		Vitamin E
	N = 262		N = 91		N = 27		N = 127		N = 12
	M	SD	M	SD	M	SD	M	SD	M	SD
SOLa	23.2	18.5	21.4	16.0	27.3	24.4	24.5	23.6	16.3	10.6
NWAKb	1.4	1.0	1.1	1.1	1.8	1.1	1.9	1.1	1.0	0.7
WASOa	24.2	26.9	28.9	31.2	27.9	27.3	29.6	29.9	16.4	19.1
TSTa	426.2	72.0	417.7	65.9	417.2	88.6	421.1	72.5	432.8	64.9
SEc	86.1	9.2	85.7	9.5	84.3	11.2	85.2	9.3	89.6	5.2
SQRd	3.4	0.6	3.4	0.7	3.3	0.7	3.5	0.7	3.7	0.9

Note 1. Comparisons between groups on all sleep variables were non-significant.

Note 2. SOL – sleep onset latency; NWAK – number of awakenings; WASO – wake time after sleep onset; TST – total sleep time; SE – sleep efficiency; SQR – sleep quality rating

^aUnit of measurement is minutes.

^bUnit of measurement is count of awakenings.

^cUnit of measurement is percentage.

^dUnit of measurement is rating on a 5-point scale