Table 3

Treatment effect sizes for anxiety, depression and psychological distress restricted to clients who completed the CBT treatment (n=360)

nMean scoreSD (post-treatment)Effect size (Cohen's d)*
PretreatmentPost-treatment
Anxiety (HADS-A)
 All36011.997.224.051.18
 Cases30013.317.824.011.36
Depression (HADS-D)
 All3607.303.173.471.19
 Cases16810.834.664.181.48
Psychological distress (GHQ-12)
 All3606.472.453.171.27
 Cases284.251.642.311.13
  • *All p<0.001.

  • CBT, cognitive-behavioural therapy; GHQ-12, General Health Questionnaire-12; HADS-A/D, Hospital Anxiety and Depression Scale Anxiety/Depression.