The impact of improved water supply on cholera and diarrhoeal diseases in Uvira, Democratic Republic of the Congo: a protocol for a pragmatic stepped-wedge cluster randomised trial and economic evaluation

Table 1 Key cluster characteristics

Cluster #	Estimated population (March 2018)	Area [km²]	*Mean # suspected cholera cases per month	*Mean monthly incidence per 1000	Existing pipe length [m]	Pipe length to rehabilitate [m]	Length of new pipes to install [m]	# existing household connections	# provisionally planned new household connections	Number of planned new community taps	Allocation sequence
1	4291	2.02	1.9	0.4	2152	57	2628	16	66	6	15
2	4990	0.76	6.0	1.2	1578	1658	1792	89	25	3	16
3	11,183	0.87	6.4	0.6	5574	1266	1864	171	25	7	10
4	7328	1.02	5.4	0.7	2347	0	3398	25	100	5	12
5	13,649	1.27	4.4	0.3	2786	797	4177	19	205	4	9
6	8389	0.48	5.8	0.7	1730	499	2328	43	82	6	13
7	7480	0.37	2.0	0.3	4525	367	1065	152	26	2	8
8	15,455	0.43	4.8	0.3	2961	1097	1793	199	25	5	7
9	3994	0.36	9.4	2.4	3848	189	2446	183	25	8	11
10	14,175	0.59	7.1	0.5	8901	692	1520	525	25	7	1
11	56,106	1.70	14.5	0.3	8775	1599	2401	633	254	16	5
12	12,462	0.99	3.0	0.2	2292	1455	1844	22	193	1	14
13	50,764	2.75	10.4	0.2	17,781	1666	1266	1384	24	11	4
14	16,175	0.55	6.7	0.4	907	0	2549	35	220	5	3
15	15,183	0.81	7.2	0.4	4091	135	2420	161	62	9	2
16	19,338	1.98	10.6	0.6	1788	2061	2874	28	318	20	6
Mean	16,310	1.06	6.6	0.4**	72,033	13,538	36,363	3685	1675	7.2	–
Minimum	3994	0.36	1.9	0.2	907	0	1065	16	25	1	–
Maximum	56,106	2.75	14.5	2.4	17,781	2061	4177	1384	318	20	–

*Based on CTC admissions between January 1, 2009, and March 31, 2018, and population in March 2018
**Mean weighted by cluster population size

ISSN: 1745-6215