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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