Table 3.

Contrasts derived from the negative binomial models^* for different condemnation codes to determine the differences among years and seasons

	Total condemned			Pneumonia			Arthritis			Nephritis			Enteritis
	IRRa	95% CI b	P-value	IRR	95% CI	P-value	IRR	95% CI	P-value	IRRa	95% CI b	P-value	IRR	95% CI	P-value
2005 vs 2006
Winter	0.99	0.88–1.10	0.88	0.95	0.67–1.36	0.8	0.77	0.59–0.99	0.05	0.37	0.25–0.55	< 0.001	0.97	0.52–1.81	0.94
Spring	1.59	1.41–1.79	< 0.001	2.16	1.42–3.29	< 0.001	1.51	1.15–1.99	0.003	0.97	0.70–1.33	0.84	0.48	0.27–0.86	0.01
Summer	2.12	1.89–2.37	< 0.001	3.58	2.35–5.46	< 0.001	2.35	1.75–3.15	< 0.001	0.60	0.44–0.82	0.002	0.37	0.22–0.62	< 0.001
Fall	1.47	1.32–1.64	< 0.001	1.45	0.98–2.5	0.06	1.40	1.07–1.83	0.01	0.81	0.62–1.05	0.12	0.18	0.10–0.32	< 0.001
2005 vs 2007
Winter	1.11	1.00–1.24	0.05	1.62	1.12–2.34	0.01	0.91	0.69–1.19	0.5	0.18	0.13–0.26	< 0.001	0.14	0.08–0.22	< 0.001
Spring	1.29	1.16–1.46	< 0.001	1.27	0.87–1.86	0.21	1.30	1.00–1.69	0.04	0.39	0.30–0.52	< 0.001	0.26	0.15–0.45	< 0.001
Summer	2.81	2.49–3.16	< 0.001	5.47	3.46–864	< 0.001	2.50	1.86–3.33	< 0.001	0.68	0.50–0.94	0.02	0.48	0.28–0.79	0.005
Fall	2.43	2.17–2.73	< 0.001	5.50	3.28–9.2	< 0.001	4.31	3.04–6.12	< 0.001	1.41	1.06–1.89	0.02	0.93	0.47–1.84	0.84
2006 vs 2007
Winter	1.13	1.01–1.25	0.03	1.69	1.18–2.4	0.004	1.18	0.92–1.52	0.18	0.48	0.37–0.62	< 0.001	0.14	0.08–0.20	< 0.001
Spring	0.81	0.72–0.92	< 0.001	0.58	0.39–0.89	0.01	0.86	0.65–1.13	0.28	0.41	0.31–0.54	< 0.001	0.54	0.35–0.83	0.005
Summer	1.32	1.17–1.50	< 0.001	1.52	0.90–2.57	0.11	1.06	0.76–1.47	0.73	1.13	0.84–1.51	0.39	1.27	0.84–1.93	0.25
Fall	1.65	1.47–1.85	< 0.001	3.77	2.22–6.39	< 0.001	3.08	2.15–4.41	< 0.001	1.74	1.32–2.31	< 0.001	4.99	2.95–8.45	< 0.001

^*From Table 2.

^aIncidence rate ratio.

^bConfidence intervals.