TABLE 3. PSQI for the subjects at baseline during blue-enriched and blue-suppressed light.

	Baseline	Blue-enriched	Blue-supressed
Sleep quality by gender
Male: PSQI, total score
Mean (SE)	4.06 (0.67)	4.31 (1.04)	4.13 (0.97)
95% clm	2.64–5.49	2.09–6.54	2.06–6.20
Female: PSQI, total score
Mean (SE)	7.62 (1.14)	5.62 (0.87)	5.85 (0.88)
95% clm	5.13–10.00	3.71–7.52	4.02–7.67
p value for comparison of genders	0.009	0.361	0.198
Male: comparison to baseline
p value		0.721	0.784
t-Value		0.36	0.28
DF		15	14‡
Female: comparison to baseline
p value		0.007	0.079
t-Value		3.22	1.92
DF		12	12

Data are presented as the mean, standard error (SE) and 95% confidence limits (95% clm). At baseline the PSQI was significantly higher for women than in men, thereafter the PSQI was similar for both genders. For females, a significant decrease was found from baseline to blue-enriched conditions, for the change to blue-deprived conditions we also found a decrease, but this did not reach statistical significance.