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Table 3 Comparisons between intervention group and control group on outcome measures

From: A controlled trial of Cognitive Behavioural Therapy-based strategies for insomnia among in-school adolescents in southern Nigeria

Variables Intervention group (n = 25 at baseline) (n = 21 at post intervention)
M(SD)
Control group (n = 25 at baseline) (n = 16 at post intervention)
M(SD)
F value P value np2
Baseline Post Difference Baseline Post Difference
ISI 18.29 (1.22)a 6.76 (1.81) 11.53 13.25 (2.23)g 11.29 (2.10) 1.96 F (1, 34) = 1.10 0.0001 0.59
SOL (min) 15.65 (3.10)b 8.04 (2.79) 7.61 12.84 (3.26)h 19.88 (2.76) − 7.04 F (1, 33) = 1.41 0.0001 0.39
TSD (h) 6.02 (1.54)c 8.43 (1.20) 2.41 5.78 (1.31)i 5.71 (1.46) 0.07 F (1, 33) = 1.03 0.0001 0.47
SMFQ 9.35 (1.64)d 3.55 (2.59) 5.8 8.42 (1.64)j 6.85 (2.39) 1.57 F (1, 31) = 1.32 0.002 0.34
SHQ 2.94 (1.67)e 2.54 (1.67) 0.4 2.80 (1.71)k 2.90 (1.64) − 0.1 F (1, 32) = 1.08 0.08 0.15
KSQ 11.90 (1.23)f 16.82 (1.14) 4.92 12.05 (1.29)l 12.53 (1.31) 0.48 F (1, 34) = 1.02 0.001 0.36
  1. T tests for between group comparisons at baseline and post intervention
  2. ISI Insomnia Severity Index, SOL sleep onset latency, TSD total sleep duration, SMFQ Short Mood and Feelings Questionnaire, SHQ Sleep Hygiene Questionnaire, KSQ Knowledge of Sleep Questionnaire
  3. at (df) = 1.96 (48); p = 0.06
  4. bt (df) = 0.61 (48); p = 0.55
  5. ct (df) = 0.41 (48); p = 0.68
  6. dt (df) = 0.51 (48); p = 0.61
  7. et (df) = 0.31 (45); p = 0.76
  8. ft (df) = − 0.21 (48); p = 0.85
  9. gt (df) = − 2.35 (35); p = 0.03
  10. ht (df) = − 2.62 (34); p = 0.01
  11. It (df) = 4.11 (34); p = 0.0001
  12. jt (df) = − 2.08 (32); p = 0.05
  13. kt (df) = − 0.83 (35); p = 0.41
  14. lt (df) = 4.40 (35); p = 0.0001