Table 2 Estimated sample size calculations for number of antenatal visits
From: Evaluation of Lay Support in Pregnant women with Social risk (ELSIPS): a randomised controlled trial
Average number of antenatal visits | Average number in intervention arm | Difference | Power | Sample sizeper arm |
|---|---|---|---|---|
8.9 | 10.9 | 2 | 90% | 190 |
9.4 | 10.9 | 1.5 | 90% | 337 |