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Table 3 Sleep timing measures, interactions between groups

From: Efficacy of a behavioral self-help treatment with or without therapist guidance for co-morbid and primary insomnia -a randomized controlled trial

  Pre to Post Pre to Fu3
  BTS v/s WL BTS v/s BT BT v/s WL BTS v/s WL BTS v/s BT BT v/s WL
  p Effect size (ηp 2)a p Effect size (ηp 2) p Effect size (ηp 2) p Effect size (ηp 2) p Effect size (ηp 2) p Effect size (ηp 2)
SOL < .001 0.21 .06 0.04 .01 0.08 .003 0.10 .64 0.00 .02 0.07
WASO < .001 0.20 .005 0.09 .11 0.03 .04 0.05 .23 0.02 .35 0.01
TST .09 0.03 .92 0.00 .06 0.04 .01 0.07 .34 0.01 .04 0.05
SE < .001 0.33 < .001 0.19 .004 0.09 < .001 0.19 .02 0.06 .004 0.09
  1. Abbreviations: Pre, Pre-treatment assessment; Post, Post-treatment assessment; Fu3, 3-month follow-up assessment; BTS, Bibliotherapy with support; WL, Waiting list control group; BT, Bibliotherapy; SOL, Sleep Onset Latency; WASO, Wake After Sleep Onset; TST, Total Sleep Time; SE, Sleep Efficiency
  2. a ηp 2 (Eta 2) is interpreted as explained variance in the sample