Table 5. Purely spatial clusters of smear-positive pulmonary tuberculosis with significant most likely and secondary clusters in the Sidama Zone in southern Ethiopia, 2003–2012.

Cluster type	Year	Number of cluster locations	Observed cases	Expected cases	Likelihood ratio	Relative risk	P-value
Most likely cluster	2003	176	909	475	291	3.89	<0.001
Most likely cluster	2004	155	891	482	232	3.1	<0.001
Secondary	2004	12	141	47	64	3.2	<0.001
2nd secondary	2004	1	24	6	16	4.2	<0.001
Most likely cluster	2005	235	958	637	147	2.6	<0.001
Secondary	2005	9	74	27	27	2.8	<0.001
2nd secondary	2005	5	57	19	25	3.1	<0.001
Most likely	2006	178	817	483	169	2.7	<0.001
Secondary cluster	2006	9	69	26	24	2.7	<0.001
2nd secondary	2006	4	39	16	11	2.5	0.003
Most likely	2007	152	822	509	128	2.2	<0.001
Secondary	2007	1	22	2	36	13.5	<0.001
2nd Secondary	2007	5	55	18	24	3.1	<0.001
3rd Secondary	2007	2	22	4	21	6.3	<0.001
Most likely cluster	2008	192	1,416	926	204	2.3	<0.001
Secondary cluster	2008	6	52	26	9	2	0.032
Most likely cluster	2009	155	1,139	697	190	2.3	<0.001
Secondary clusters	2009	8	111	50	28	2.3	<0.001
2nd Secondary	2009	1	16	4	11	4.2	0.011
3rd secondary	2009	1	25	9	10	3	0.014
4th secondary	2009	1	18	5	10	3.6	0.020
Most likely cluster	2010	11	187	63	83	3.2	<0.001
Secondary cluster	2010	20	146	83	20	1.8	<0.001
2nd Secondary	2010	1	24	5	18	4.7	<0.001
3rd Secondary	2010	16	90	46	17	2.04	<0.001
4th secondary	2010	3	47	20	13	2.4	<0.001
5th Secondary	2010	3	36	14	12	2.7	0.002
6th secondary	2010	1	14	3	11	4.7	0.009
Most likely cluster	2011	180	2,019	1,531	122	1.6	<0.001
Secondary cluster	2011	13	187	95	35	2.02	<0.001
2nd Secondary	2011	1	38	7	33	5.5	<0.001
Most likely cluster	2012	9	205	65	100	3.3	<0.001
Secondary cluster	2012	13	196	91	46	2.2	<0.001
2nd Secondary	2012	56	658	468	39	1.5	<0.001
3rd Secondary	2012	29	359	250	22	1.5	<0.001
4th Secondary	2012	3	42	17	13	2.6	<0.001
5th Secondary	2012	4	73	39	12	1.9	0.003
6th Secondary	2012	1	25	8	11	3.1	0.006
7th Secondary	2012	1	17	5	9	3.5	0.05