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

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

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
Variables	Baseline	Post	Difference	Baseline	Post	Difference	F value	P value	np²
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

T tests for between group comparisons at baseline and post intervention
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
^at (df) = 1.96 (48); p = 0.06
^bt (df) = 0.61 (48); p = 0.55
^ct (df) = 0.41 (48); p = 0.68
^dt (df) = 0.51 (48); p = 0.61
^et (df) = 0.31 (45); p = 0.76
^ft (df) = − 0.21 (48); p = 0.85
^gt (df) = − 2.35 (35); p = 0.03
^ht (df) = − 2.62 (34); p = 0.01
^It (df) = 4.11 (34); p = 0.0001
^jt (df) = − 2.08 (32); p = 0.05
^kt (df) = − 0.83 (35); p = 0.41
^lt (df) = 4.40 (35); p = 0.0001

ISSN: 1753-2000