Spatial distribution of HIV, HCV, and co-infections among drug users in the southwestern border areas of China (2004–2014): a cohort study of a national methadone maintenance treatment program

Table 2 General description of the clusters with high and low prevalence of HIV, HCV and co-infections among MMT clients in Guangxi (2004 ~ 2014)

Type of infection	Type of cluster	No. of counties/cities	Radius (km²)	MMT clients	No. of infections	Relative risk	Log likelihood ratio	P value
HIV infection	High risk cluster	14	11.95	7074	1405	1.80	147.72	<0.001
		2	6.24	627	220	2.79	81.90	<0.001
		2	6.14	708	173	1.91	28.76	<0.001
		1	0.00	1133	466	3.43	230.27	<0.001
	Low risk cluster	7	11.23	2556	74	0.21	156.90	<0.001
		7	8.91	4209	144	0.24	234.95	<0.001
		5	9.29	2366	116	0.36	84.01	<0.001
HCV infection	High risk cluster	14	11.95	7074	5626	1.13	30.50	<0.001
		8	9.48	6692	5655	1.22	81.59	<0.001
	Low risk cluster	12	12.01	4224	2392	0.75	90.92	<0.001
		4	7.61	1142	684	0.82	13.80	0.002
		1	0.00	680	381	0.77	14.11	0.008
		1	0.00	342	5	0.02	224.78	<0.001
HIV/HCV co-infection	High risk cluster	13	10.95	4888	1008	2.00	156.03	<0.001
		2	6.24	627	201	2.78	74.43	<0.001
		2	6.14	708	160	1.93	27.31	<0.001
		1	0.00	1133	466	3.43	230.27	<0.001
	Low risk cluster	7	8.91	4209	129	0.23	219.66	<0.001
		7	11.32	2556	68	0.21	143.51	<0.001
		5	9.29	2366	102	0.34	81.52	<0.001
		1	0.00	342	0	0.00	25.11	<0.001

ISSN: 1471-2458