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Table 6 Multi-predictor model of mortality risk

From: Journal impact factor, trial effect size, and methodological quality appear scantly related: a systematic review and meta-analysis

PredictorOdds ratio (95% CI)*p value
Impact factor in 1993 (per unit of impact factor)0.986 (0.96, 1.02)0.37
Mortality is primary outcome0.62 (0.31, 1.25)0.18
Mortality in primary paper1.25 (0.67, 2.33)0.48
Centers, number0.997 (0.98, 1.01)0.64
Industry funding0.93 (0.60, 1.43)0.73
Peer review funding1.08 (0.74, 1.59)0.69
Random sequence0.87 (0.59, 1.28)0.47
Allocation concealed, clearly adequate (A) or not (BCD)1.42 (0.91, 2.20)0.12
Double-blind0.76 (0.48, 1.21)0.25
Analysis as randomized0.96 (0.56, 1.64)0.88
Sample size1.000076 (0.99989, 1.00026)0.43
Europe0.95 (0.60, 1.49)0.81
Asia1.02 (0.43, 2.39)0.97
Other non-USA/Canada0.80 (0.38, 1.71)0.57
  1. CI confidence interval