Adverse drug reactions due to opioid analgesic use in New South Wales, Australia: a spatial-temporal analysis

Table 2 Clusters of opioid-related adverse drug reactions for hospitalisation in NSW

Cluster	No. post-code areas	Observed cases	Expected cases	Log likelihood ratio	Relative risk	p-value
2004–05 to 2008–09
Most likely cluster	3	49	22.69	11.45	2.17	0.010
2nd	109	2599	1605.02	335.21	1.90	0.001
3rd	22	465	278.70	53.89	1.71	0.001
Least likely cluster	3	142	87.66	14.33	1.63	0.001
2009–10 to 2013–14
Most likely cluster	1	94	55.61	10.99	1.69	0.020
2nd	14	1015	635.27	99.99	1.63	0.001
3rd	2	201	127.29	18.26	1.59	0.001
4th	13	696	487.26	40.64	1.45	0.001
5th	121	4526	3452.59	191.41	1.41	0.001
6th	10	434	312.59	21.42	1.40	0.001
Least likely cluster	13	527	430.18	10.42	1.23	0.033

ISSN: 2050-6511