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Table 4 PSQI results, HADS results, and use of hypnotics and anti-depressants after 3 months in the intervention group (n = 19) and the control group (n = 13)

From: Assessing the feasibility and acceptability of a cluster-randomized study of cognitive behavioral therapy for chronic insomnia in a primary care setting

Variable Intervention group
n (%)
Control Group
n (%)
P value
Subjective sleep quality
 Very good/quite good 10 (62.5) 3 (30.0) 0.107
 Very bad/quite bad 6 (37.5) 7( 70.0)  
Sleep latency (min)
 0–4 14 (82.4) 5 (45.5) 0.041
 5–6 3 (17.6) 6 (54.5)  
Sleep duration (h)
 5 h or more 11 (68.8) 1 (11.1) 0.006
  < 5 h 5 (31.3) 8 (88.9)  
Sleep disruptions
 1–9 15 (88.2) 6 (54.5) 0.044
 10–27 2 (11.8) 5 (45.5)  
Use of a hypnotica
 None in the last month 10 (58.8) 4 (36.4) 0.408
 1 or 2 times per week 2 (11.8) 1 (9.1)  
 3 or more times per week 5 (29.4) 6 (54.5)  
Day dysfunction
 0 5 (29.4) 4 (36.4) 0.249
 1–2 8 (47.1) 2 (18.2)  
 3–6 4 (23.5) 5 (45.5)  
HADS depressiona
 None (0–7) 14 (82.4) 9 (81.8) 0.971
 Possible (≥ 8) 3 (17.6) 2 (18.3)  
HADS anxiety
 None (0–7) 9 (52.9) 6 (54.5) 0.934
 Possible (≥ 8) 8 (47.1) 5 (45.5)  
Hypnotic usea
 No 6 (42.9) 2 (28.6) 0.276
 Yes 6 (42.9) 5 (42.9)  
  < 4 doses/months 2 (14.3) 0 (0.0)  
Beginning hypnotic usea
 Yes 0 (0.0) 1 (33.3) 0.117
 No 6 (100.0) 2 (66.7)  
Beginning antidepressant usea
 Yes 1 (7.1) 3 (33.3) 0.107
 No 13 (92.9) 6 (66.7)  
  1. a Likelihood ratio test for contingency tables