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Table 2 Primary outcome - randomised to host trial

From: Can we achieve better recruitment by providing better information? Meta-analysis of ‘studies within a trial’ (SWATs) of optimised participant information sheets

Study Optimised Standard Odds ratio 95% CI % weight
CASPER 116 / 5765 113 / 5766 1.027 0.791 to 1.334 27.5
ECLS 180 / 1136 176 / 1126 1.016 0.660 to 1.564 10.1
Healthlines (Depression) 43 / 682 27 / 682 1.630 1.000 to 2.670 7.8
Help Diabetes 183 / 2510 166 / 2370 1.044 0.589 to 1.852 5.7
ISDR 422 / 1666 393 / 1503 0.951 0.752 to 1.201 34.2
REFORM 63 / 2301 62 / 2298 1.010 0.710 to 1.450 14.7
Pooled 1007 / 14,060 (7.2%) 937 / 13,745 (6.8%) 1.034 0.902 to 1.186 100.0
  1. Heterogeneity chi-squared = 3.82, p = 0.576; I2 = 0.0%; estimate of between-study variance = 0.000; test of pooled odds ratio = 1: z = 0.48, p = 0.630
  2. Sensitivity analysis excluding ISDR trial results: pooled odds ratio = 1.08 (95% CI 0.913 to 1.279, p = 0.370); I2 = 0.0%, p = 0.547