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Table 3 Simulation results showing the impact of number of live births per cluster and number of clusters on k estimates for rare outcomes

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

Live births per cluster Simulation mean k for maternal mortality 75th percentile of estimated k for maternal mortality Simulation mean k for neonatal mortality 75th percentile of estimated k for neonatal mortality
200 0.23 0.44 0.070 0.14
400 0.19 0.37 0.045 0.090
800 0.12 0.26 0.034 0.071
1600 0.10 0.20 0.021 0.042
3200 0.06 0.13 0.018 0.036
Clusters     
16 0.23 0.42 0.059 0.12
32 0.18 0.37 0.047 0.092
64 0.15 0.28 0.040 0.084
128 0.15 0.28 0.035 0.072