Recommendations for the analysis of individually randomised controlled trials with clustering in one arm – a case of continuous outcomes

Table 4 Summary of results for the CPSW case study (n=539)

Model	Treatment estimate	Standard error	Residual variance	Random variance	Control variance	ICC
Ignore clustering	-1.62	1.60	343.31
Random effects
Individual clusters of size 1	-1.62	1.60	343.31	<0.0001		<0.0001^a
One large cluster	-1.62	1.60	343.31	<0.0001		<0.0001^a
Artificial-clusters	-1.62	1.60	343.31	<0.0001		<0.0001^a
Partially clustered
Individual clusters of size 1	-1.62	1.60	343.31	<0.0001		<0.0001^b
One large cluster	-1.62	1.60	343.31	<0.0001		<0.0001^b
Artificial-clusters	-1.62	1.60	343.31	<0.0001		<0.0001^b
Heteroskedastic
Individual clusters of size 1	-1.62	1.60	339.42	<0.0001	347.38	<0.0001^b
One large cluster	-1.62	1.60	339.42	<0.0001	347.39	<0.0001^b
Artificial-clusters	-1.62	1.60	339.42	<0.0001	347.39	<0.0001^b

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