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Table 1 Anticipated precision with n = 140 (pooled)

From: Vaginal progesterone to reduce preterm birth among HIV-infected pregnant women in Zambia: a feasibility study protocol

 

Observed proportion (adherence, retention)

0.5

0.6

0.7

0.8

0.9

0.95

Normal approximation of precision

±0.083

±0.081

±0.076

±0.066

±0.050

±0.036

Exact binomial 95% CI

0.41, 0.59

0.51, 0.68

0.62, 0.77

0.72, 0.86

0.84, 0.94

0.90, 0.98