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. 2022 Sep 26;12(9):e060694. doi: 10.1136/bmjopen-2021-060694

Table 1.

Sample size calculation for risk factors of GDM in Goba town, Southeast Ethiopia, 2021

Exposure variables Proportion in non-exposed Proportion in the exposed Power of the study Crude OR Sample size Total sample size after considering 15% loss to follow-up
History of stillbirth14 5.17% 14% 80 2.97 417 480
History of abortion15 16.3% 45.5% 80 4.2 101 116
History of GDM27 1.8% 12% 80 7.4 236 271

GDM, gestational diabetes mellitus.