A controlled trial of the Litebook light-emitting diode (LED) light therapy device for treatment of Seasonal Affective Disorder (SAD)

Table 2 Mean times of sleep and treatment during baseline week and during first and last weeks of treatment.

	Sleep onset time		Sleep midpoint time		Sleep end time
	Active	Placebo	Active	Placebo	Active	Placebo
Baseline week	23:04 ± 1:01	23:08 ± 0:50	3:06 ± 0:44¹	3:17 ± 0:59	7:07 ± 0:51²	7:26 ± 1:22
First week treatment	23:11 ± 0:45	22:58 ± 0:30	2:48 ± 0:32¹	2:57 ± 0:46	6:25 ± 0:40^2,3	6:56 ± 1:14
Last week treatment	23:05 ± 0:49	22:58 ± 0:60	2:52 ± 0:38	2:55 ± 0:55	6:39 ± 0:44³	6:52 ± 0:60
	Time of treatment		Time to treatment after midpoint of sleep
	Active	Placebo	Active	Placebo
First week treatment	6:42 ± 0:44⁴	7:03 ± 0:45	3:54 ± 0:29⁵	4:03 ± 0:34
Last week treatment	6:55 ± 0:45⁴	7:07 ± 0:50	4:01 ± 0:28⁵	4:02 ± 0:35

Notes: Data is included for all participants who completed the trial, n = 14 for active and n = 9 for placebo treatment. No comparison between active and placebo group was statistically significant for any of the variables shown. Comparisons between the first week treatment and the baseline week or last week of treatment that were significant at p ≤ 0.05 in paired t test are indicated by shared superscripts.

ISSN: 1471-244X