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Confidence Intervals and Sample-size Calculations for the Sisterhood Method of Estimating Maternal Mortality
James A. Hanley, Catherine A. Hagen and Tesfaye Shiferaw
Studies in Family Planning
Vol. 27, No. 4 (Jul. - Aug., 1996), pp. 220-227
Published by: Population Council
Stable URL: http://www.jstor.org/stable/2137955
Page Count: 8
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The sisterhood method is an indirect method of estimating maternal mortality that has, in comparison with conventional direct methods, the dual advantages of ease of use in the field and smaller sample-size requirements. This report describes how to calculate a standard error to quantify the sampling variability for this method. This standard error can be used to construct confidence intervals and statistical tests and to plan the size of a sample survey that employs the sisterhood method. Statistical assumptions are discussed, particularly in relation to the effective sample size and to effects of extrabinomial variation. In a worked example of data from urban Pakistan, a maternal mortality ratio of 153 (95 percent confidence interval between 96 and 212) deaths per 100,000 live births is estimated.
Studies in Family Planning © 1996 Population Council