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Table 3 Baseline to post-randomisation follow-up correlations by trial

From: Sample size estimation for randomised controlled trials with repeated assessment of patient-reported outcomes: what correlation between baseline and follow-up outcomes should we assume?

Trial name Pearson baseline to post-randomisation follow-up correlation
Mean Median No. of correlations SD Minimum Maximum
Leg Ulcer 0.48 0.5 N = 18 0.13 0.23 0.71
NAMEIT 0.46 0.46 N = 54 0.1 0.21 0.63
Homeopathy for CFS 0.5 0.53 N = 5 0.19 0.18 0.65
Acupuncture 0.44 0.45 N = 24 0.12 0.2 0.62
Knee Replacement 0.45 0.48 N = 14 0.16 0.09 0.65
FED 0.5 0.56 N = 18 0.12 0.32 0.7
AIM-High 0.46 0.49 N = 60 0.14 0.16 0.74
PoNDER 0.44 0.47 N = 26 0.11 0.19 0.58
COPD 0.53 0.54 N = 48 0.08 0.37 0.68
Corn Plaster 0.45 0.45 N = 12 0.06 0.33 0.53
PLINY 0.67 0.74 N = 15 0.15 0.41 0.87
3Mg 0.39 0.39 N = 1 - 0.39 0.39
SELF 0.44 0.44 N = 9 0.07 0.31 0.54
BEADS 0.46 0.53 N = 3 0.3 0.14 0.71
DiPALS 0.54 0.57 N = 65 0.18 0.01 0.91
Lifestyle Matters 0.66 0.64 N = 28 0.11 0.45 0.88
IPSU 0.57 0.63 N = 15 0.13 0.34 0.73
POLAR 0.32 0.36 N = 15 0.14 0.04 0.53
PRACTICE 0.36 0.38 N = 6 0.36 −0.13 0.79
STEPWISE 0.53 0.56 N = 28 0.13 0.24 0.72
Totala 0.5 0.51 N = 464 0.15 −0.13 0.91
  1. aThe summary statistics for the total row are calculated from 464 correlations