TABLE 1.

Effects of PZG supplementation on total sleep duration and PSQI scores.

Items	Time (week)	PZG group (n = 30)			Placebo group (n = 30)			p value for change scores (PZG group vs placebo group)
		Mean ± SE	p Value (vs. baseline)	Change (vs. baseline)	Mean ± SE	p Value (vs. baseline)	Change (vs. baseline)
Sleep duration	0	390.57 ± 11.02			400.30 ± 13.54
	2	426.60 ± 11.65	.009	11.73 ± 7.23	405.50 ± 16.10	.894	6.77 ± 8.10	.147
	4	441.20 ± 14.29	.006	12.50 ± 10.54	393.40 ± 19.50	.669	0.40 ± 7.52	.016
PSQI scores	0	10.73 ± 0.44			10.50 ± 0.50
	2	5.77 ± 0.41	.000	−4.97 ± 0.46	10.23 ± 0.52	.451	−0.27 ± 0.41	.000
	4	4.30 ± 0.44	.000	−6.43 ± 0.55	9.90 ± 0.48	.221	−0.60 ± 0.43	.000