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

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

  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 ± 0:402,3 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   
  1. 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.