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Table 2 Correlation between SMD, the placebo response and the active treatment response and the year of publication

From: An investigation of the constancy of effect in Cochrane systematic reviews in context with the assumptions for noninferiority trials

Correlation

SMD

Placebo, N (%)

Active treatment, N (%)

Strong Negative

47 (19.9%)

29 (12.9%)

34 (15.1%)

Moderate Negative

38 (16.1%)

16 (7.1%)

31 (13.8%)

Weak Negative

53 (22.5%)

47 (20.9%)

51 (22.7%)

Weak Positive

45 (19.1%)

60 (26.7%)

58 (25.8%)

Moderate Positive

32 (13.6%)

35 (15.6%)

18 (8%)

Strong Positive

21 (8.9%)

38 (16.9%)

33 (14.7%)

Total

236. (100%)

226 (100%)

226 (100%)

  1. SMD Standardised Mean Difference, N (total number of reviews)