Regional differences in acute hospitalization risk associated with NO2 by cause, season, age, sex, and trend: an ecological time series study in Canada

Table 2 Annual ratio of specific-cause hospitalization counts to population from 1996–2012

Year	Ischemic Heart Disease (IHD, ICD-10, I20-I25)			Other forms of Heart Diseases (OHD, ICD-10, I30-I52)			Cerebrovascular Diseases (CEV, ICD-10, I60-I69)			Chronic Lower Respiratory Diseases (CLRD, ICD-10, J40-J47)			Influenza and Pneumonia (InfPn, ICD-10, J09-J18)
Year	% ratio^a	% female^b	% in warm^c	% ratio^a	% female^b	% in warm^c	% ratio^a	% female^b	% in warm^c	% ratio^a	% female^b	% in warm^c	% ratio^a	% female^b	% in warm^c
1996	0.45	38	49	0.33	49	49	0.19	51	50	0.24	51	45	0.19	48	41
1997	0.44	38	50	0.33	49	49	0.18	51	49	0.22	50	47	0.18	48	40
1998	0.43	37	49	0.33	49	49	0.18	51	50	0.23	51	41	0.21	48	38
1999	0.43	37	49	0.31	49	48	0.17	51	49	0.24	51	41	0.22	49	35
2000	0.43	37	49	0.30	49	49	0.17	52	50	0.20	51	45	0.19	49	40
2001	0.41	36	49	0.29	49	48	0.15	52	49	0.19	51	46	0.18	49	43
2002	0.40	36	49	0.28	49	49	0.14	51	48	0.19	50	46	0.16	48	41
2003	0.38	35	48	0.27	48	48	0.13	51	49	0.19	50	45	0.15	49	40
2004	0.37	35	49	0.28	49	49	0.13	50	50	0.20	50	45	0.14	49	41
2005	0.34	35	49	0.28	48	49	0.13	50	49	0.22	50	45	0.15	50	41
2006	0.32	35	49	0.27	49	48	0.12	49	49	0.20	50	47	0.13	49	42
2007	0.30	33	48	0.27	48	49	0.12	49	49	0.19	50	45	0.12	49	44
2008	0.29	33	48	0.27	48	49	0.12	49	49	0.19	50	47	0.13	50	44
2009	0.27	33	49	0.27	49	49	0.11	50	49	0.18	51	45	0.15	50	40
2010	0.27	33	49	0.28	49	49	0.11	49	50	0.18	51	47	0.13	50	43
2011	0.25	33	49	0.28	49	49	0.11	49	49	0.18	51	46	0.14	50	42
2012	0.25	33	49	0.29	48	49	0.11	49	50	0.19	51	45	0.14	50	41
Eastern	0.22	36	49	0.17	49	48	0.09	51	49	0.12	54	44	0.09	51	41
Central	0.60	37	49	0.49	49	49	0.22	50	49	0.31	50	45	0.26	49	41
Western	0.18	33	49	0.15	49	49	0.07	50	50	0.12	50	48	0.09	49	43
Overall	0.35	35	49	0.29	49	49	0.14	50	49	0.20	50	45	0.16	49	41

^a(Study specific hospitalization counts/ Study population) *100
^b(hospitalization counts for females (≥ 1 year old) / hospitalization counts for both sexes (≥ 1 year old)) *100
^c(hospitalization counts in the warm season (April-September) / year-round (January-December) counts) *100

ISSN: 1471-2458