Table 1 Sample size determination using Epi Info 7.0 StatCalc program
Variables | Percentage of controls exposed to the risk factor | Adjusted odds ratio | Sample size | Total sample size | Final sample size after 10% contingency | Reference |
|---|---|---|---|---|---|---|
Residence | 20.3% | 3.0 | Cases = 53 Controls = 105 | 158 | 176 | Sahle et al., 2023 [17] |
Number of vaginal examinations | 12.4% | 4.53 | Cases = 35 Controls = 69 | 104 | 116 | Tesfaye et al., 2023 [18] |
Duration of rupture of membrane | 4.4% | 4.1 | Cases = 88 Controls = 175 | 263 | 292 | Sahle et al., 2023 [17] |
Mode of delivery | 20.7% | 3.85 | Cases = 30 Controls = 90 | 120 | 133 | Demisse et al.,2019 [16] |