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Table 1 Study-level covariate values, observed effect size measures and pooled heterogeneity estimates listed in order of increasing relative risk

From: Factors explaining the heterogeneity of effects of patient decision aids on knowledge of outcome probabilities: a systematic review sub-analysis

Study Type of controla IPDASi, probability dimension score/32 Rescaled IPDASi, probability dimension score (%) CER Logit control ln(OR) ORb RRb
Lerman et al.[28] A 16 33 0.66 0.65 0.37 1.46 1.12
Johnson et al. [32] A 16 33 0.77 1.17 0.96 2.86 1.17
Wolf and Schorling [24] B 19 46 0.54 0.16 0.73 2.08 1.31
Whelan et al. [25] A 17 38 0.58 0.32 0.91 2.52 1.34
McBride et al. [27] A 23 63 0.30 −0.85 0.49 1.64 1.37
Schapira and Vanruiswyk [23] B 28 83 0.47 −0.10 0.89 2.45 1.45
Dodin et al. [31] B 26c 75 0.43 −0.28 0.82 2.32 1.48
O’Connor et al. [8] C 26c 75 0.46 −0.14 1.05 2.91 1.54
Whelan et al. [21] B 22 58 0.37 −0.53 0.82 2.29 1.55
Kuppermann et al. [36] C NA NA 0.32 −0.76 1.35 3.88 2.03
Vandemheen et al. [37] B 30 92 0.29 −0.88 1.52 4.67 2.26
McAlister et al. [29] A 29d 88 0.16 −1.62 1.11 3.06 2.29
Mathieu et al. [34] B 31 96 0.22 −1.29 1.54 4.71 2.62
Man-Son-Hing et al., [30] A 29d 88 0.24 −1.16 1.83 6.32 2.80
Weymiller et al. [35] B 32 100 0.18 −1.48 1.88 6.94 3.38
Laupacis et al. [33] A 24 67 0.08 −2.34 1.50 4.88 3.72
Gattellari and Ward [22] B 21 54 0.10 −2.14 2.29 10.26 5.28
Chi-squared (heterogeneity) 55.75 56.41 120.19
I 2 71% 72% 87%
  1. a A, no standardized information; B, standardized generic information (no outcome information); C, simple decision aid (no standardized probability information).
  2. b No continuity correction was applied to match Review Manager’s output.
  3. c Same decision aid for both trials.
  4. d Same decision aid for both trials.
  5. CER, control event rate; IPDASi, International Patient Decision Aid Standards instrument; NA, full decision aid not available for rating; OR, odds ratio; RR, relative risk.