BMC Public Health

Table 1 Annual ratio of hospitalization counts to population by cause, sex and season from 1996–2012

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

	All non-accidental (ICD-10, A00-R99)				Circulatory (ICD-10, I00-I99)				Respiratory (ICD-10, J00-J99)
Year	Count	% ratio^a	% female^b	% in warm^c	% ratio^a	% of all causes^d	% female^b	% in warm^c	% ratio^a	% of all causes^d	% female^b	% in warm^c
1996	2,840,181	9.6	59	49	1.5	12	44	49	1.0	10	47	43
1997	2,731,223	9.1	59	50	1.5	12	43	50	0.9	10	47	43
1998	2,694,759	8.9	59	49	1.4	12	43	49	1.0	11	48	41
1999	2,667,100	8.8	59	49	1.4	12	43	49	1.0	11	48	39
2000	2,604,227	8.5	59	49	1.4	12	43	49	0.9	10	47	42
2001	2,532,790	8.2	59	49	1.3	12	43	49	0.8	10	47	43
2002	2,447,756	7.8	59	49	1.3	12	43	49	0.8	10	47	44
2003	2,416,859	7.6	58	49	1.2	11	42	49	0.8	10	47	43
2004	2,426,161	7.6	58	49	1.2	11	42	49	0.7	10	48	44
2005	2,027,956	6.3	58	47	0.9	11	42	46	0.7	10	48	41
2006	1,849,774	5.7	58	49	0.8	11	42	49	0.5	9	47	45
2007	1,831,969	5.6	58	50	0.8	10	42	49	0.5	9	47	44
2008	1,829,618	5.5	58	50	0.8	10	41	49	0.5	9	48	45
2009	1,840,600	5.5	58	50	0.8	10	41	50	0.5	9	48	43
2010	1,855,603	5.5	58	50	0.8	10	42	50	0.5	9	48	46
2011	1,889,247	5.5	58	50	0.8	10	41	50	0.5	9	48	44
2012	1,922,830	5.5	58	50	0.8	10	41	49	0.5	9	48	44
Eastern	561,078	5.7	57	48	1.0	12	42	48	0.6	11	48	42
Central	896,360	7.3	58	50	1.2	11	42	49	0.7	9	47	43
Western	801,895	8.3	59	50	1.1	11	42	49	0.8	10	47	44
Overall	2,259,333	7.1	58	49	1.1	11	42	49	0.7	10	47	43

^a(Study all hospitalization counts/ Study population) *100
^b(hospitalization counts for females (≥ 1 year old) / hospitalization counts for both sexes (≥ 1 year old)) *100. This includes admissions for childbirth
^c(hospitalization counts in the warm season (April-September) / year-round (January-December) counts) *100
^d(specific-cause hospitalization counts/ Study all non-accidental counts) *100, where Study all non-accidental counts are in the 2nd column

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