Minimum number of clusters and comparison of analysis methods for cross sectional stepped wedge cluster randomised trials with binary outcomes: A simulation study

Table 2 Number of convergence failures per 2000 simulations of scenario A

ICC	k	n _jk	True time effect OR = 1				True time effect OR = 1.227
ICC	k	n _jk	GEE	GLMM	Cluster summaries method	Fixed effects model	GEE	GLMM	Cluster summaries method	Fixed effects model
0.01	3	5	102	0	0	105	61	0	1	65
		10	7	0	0	7	2	0	1	2
	6	5	7	0	0	7	2	0	0	2
	9	5	1	0	0	1	0	0	0	0
0.05	3	5	193	5	1	182	133	2	0	141
		10	35	0	0	36	21	0	0	21
	6	5	10	0	0	11	8	0	0	8
	9	5	0	0	0	0	1	0	0	1
0.1	3	5	261	8	6	251	209	5	1	221
		10	85	3	0	85	63	0	0	65
		50	2	0	0	2	2	0	0	2
		100	1	0	0	0	2	0	0	2
	6	5	32	0	0	30	23	0	0	29
		10	1	0	0	1	3	0	0	3
	9	5	6	0	0	6	4	0	0	4

Only scenarios where at least one method had a convergence failure are shown. All methods adjust for time in the model

ISSN: 1745-6215