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

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

Live births per cluster	Simulation mean k for maternal mortality	75^th 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

ISSN: 1745-6215