Group cognitive behavioural therapy for women with depression: pilot and feasibility study for a randomised controlled trial using mixed methods

Table 3 Instrumental variables analyses of primary outcome (PHQ-9) at 3 and 6 months (observed data only)

	PHQ-9 score at 3 months	PHQ-9 score at 6 months
Total number of sessions	-0.24 (-0.73 to 0.26), p = 0.34	-0.18 (-0.82 to 0.45), p = 0.56
Optimum number of sessions(>5)	-2.47 (-7.51 to 2.57), p = 0.33	-1.88 (-8.34 to 4.58), p = 0.56

ISSN: 1471-244X