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Figure 3 | Trials

Figure 3

From: Intracluster correlation coefficients and coefficients of variation for perinatal outcomes from five cluster-randomised controlled trials in low and middle-income countries: results and methodological implications

Figure 3

Simulated impact of number of clusters on estimated coefficient of variation ( k ) for maternal and neonatal mortality. These simulations were run assuming that all birth outcomes were independent, i.e. the true coefficient of variation was set to zero. As the number of clusters increases, the estimated coefficient of variation falls closer to zero indicating that more clusters lead to greater reliability in estimates of the coefficient of variation. Throughout, the estimated coefficient of variation is higher for maternal mortality than for neonatal mortality. In comparison with figure 2, the number of births per cluster has a greater impact on estimates of coefficient of variation than the number of clusters.

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