The geographic distribution patterns of HIV-, HCV- and co-infections among drug users in a national methadone maintenance treatment program in Southwest China

Table 4 Cluster information for HCV infections among drug users, using the geographic scan statistic in Southwest China

Type of cluster	Number of towns	Coordinates	Radius (Km)	Population	Number of cases	Relative risk	Log likelihood ratio	Pvalue
Most likely low risk cluster	143	27.3696 N, 102.8758 E	78.64	2460	321	0.29	346.71	0.0001
Secondary high risk cluster	97	28.5478 N, 102.9428 E	55.73	1505	721	1.95	134.41	0.0001
Secondary high risk cluster	23	27.9769 N, 102.1250 E	19.14	752	406	1.98	101.19	0.0001

ISSN: 1471-2334