Table 2.

Sleep quality, overnight care quality, anxiety, depression and sleep latency characteristics of the post-intervention with blue-depleted lights compared with pre-intervention

Measure	N	Blue-depleted light	Standard lighting	Δ	P value	95% CI
		Medians
Sleep quality	21	6	5	1	0.138	(−3 to 1)
Overnight care quality	21	7	8	−1	0.895	(−1.5 to 1.5)
HADS—Anxiety	21	5	7	−2	0.004	(1.5 to 2.5)
HADS—Depression	21	3	5	−2	0.038	(0 to 2.5)
Sleep latency (min)	16	11.25	10	1.25	0.187	(−32 to 9)
		Means
Estimated sleep duration (h)	18	4.47	4.5	−0.29	0.3	(−0.8 to 1.4)

HADS, Hospital Anxiety and Depression Scale.