Table 1.

Total number of facilities needed in both arms to demonstrate absolute differences of between 10% and 20% for different values of variation between health facilities (intraclass coefficient of variation) and of numbers of patients needed in each facility

Intraclass coefficient of variation	No of patients per facility	Proportion retained in care in the integrated care arm
		70%	75%	80%
0.05	50	74	32	18
0.06	50	84	36	20
0.07	50	94	40	22
0.05	100	64	28	16
0.06	100	74	32	18
0.07	100	86	36	20
0.05	200	60	26	14
0.06	200	70	30	16
0.07	200	80	34	20

The calculations assume 90% power and a two-sided significance level of 5%.