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Table 2 Summary RORs in various subgroup analyses

From: A systematic appraisal of allegiance effect in randomized controlled trials of psychotherapy

Characteristic

No of studies

Summary ROR (95 % CI)

fixed effects

P

Summary ROR (95 % CI)

random effects

P

I 2 (%)

Overall

30

1.32 (1.14–1.52)

1.4 × 10−4

1.31 (1.03–1.66)

0.030

53

Outcome

 Psychiatric disorders

20

1.37 (1.14–1.62)

5.4 × 10−4

1.30 (0.92–1.66)

0.143

64

 Medical disorders

10

1.24 (0.97–1.57)

0.085

1.24 (0.97–1.84)

0.085

0

Types of psychotherapy

 CBT

22

1.10 (0.92–1.31)

0.311

1.07 (0.85–1.34)

0.580

19

 Supportive or counseling

3

1.44 (1.01–2.05)

0.046

1.44 (1.01–2.05)

0.046

0

 Other

5

2.22 (1.62–3.05)

8.7 × 10−7

2.35 (1.10–4.99)

0.027

79

Type of data

 Binary

18

1.50 (1.21–1.85)

2.2 × 10−4

1.39 (0.94–2.05)

0.097

21

 Continuous

12

1.19 (0.99–1.44)

0.069

1.19 (0.93–1.51)

0.164

62

  1. ROR relative odds ratio