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Table 2 Estimates for treatment effect: precision estimates presented as 95% confidence intervals

From: Pilot study to evaluate a tailored text message intervention for pregnant smokers (MiQuit): study protocol for a randomised controlled trial

95% CI Odds ratio 10% control event rate N = 200 in each group 15% control event rate N = 200 in each group 20% control event rate N = 200 in each group
1.3 0.70 to 2.42 0.77 to 2.20 0.81 to 2.09
1.5 0.82 to 2.76 0.90 to 2.51 0.94 to 2.39
1.8 1.0 to 3.26 1.09 to 2.98 1.14 to 2.85