Table 1.

California RRs for all-cause ED visits and hospitalizations, evaluated from combined primary and secondary diagnoses during the 2006 heat wave (15 July to 1 August 2006), versus the reference period (8–14 July and 12–22 August 2006), summarized by region, age, and race/ethnicity.

	ED visits			Hospitalizations
Category	Reference period	Heat-wave period	RR (95% CI)	Reference period	Heat-wave period	RR (95% CI)
California statewide	485,785	501,951	1.03 (1.02–1.04)	191,826	193,008	1.01 (1.00–1.01)
Geographic region
Central Coast	84,958	89,546	1.05 (1.04–1.06)	32,514	33,064	1.02 (1.00–1.03)
Central Valley	84,445	87,555	1.04 (1.03–1.05)	31,113	31,211	1.00 (0.99–1.02)
North Central	20,330	21,131	1.04 (1.02–1.06)	6,720	6,802	1.01 (0.98–1.05)
North Coast	25,290	26,502	1.05 (1.03–1.07)	7,997	8,197	1.03 (0.99–1.06)
South Coast	209,737	215,331	1.03 (1.02–1.03)	90,552	90,752	1.00 (0.99–1.01)
Southeast Desert	61,025	61,886	1.01 (1.00–1.03)	22,930	22,982	1.00 (0.98–1.02)
Age (years)
0–4	47,337	49,800	1.05 (1.04–1.07)	33,279	33,397	1.00 (0.99–1.02)
5–64	352,915	364,219	1.03 (1.03–1.04)	102,935	103,381	1.00 (1.00–1.01)
≥ 65	85,533	87,932	1.03 (1.02–1.04)	55,612	56,230	1.01 (1.00–1.02)
Race/ethnicity
Asian/Pacific Islander	23,431	23,942	1.02 (1.00–1.04)	14,741	14,880	1.01 (0.99–1.03)
African American	50,439	51,404	1.02 (1.01–1.03)	15,621	15,314	0.98 (0.96–1.00)
Latino/Hispanic	147,620	153,627	1.04 (1.03–1.05)	58,630	58,893	1.00 (0.99–1.02)
Native American/Alaska Native	1,677	1,764	1.05 (0.98–1.13)	506	485	0.96 (0.85–1.09)
Other	17,327	18,123	1.05 (1.02–1.07)	5,420	5,648	1.04 (1.00–1.08)
Unreported	22,328	23,779	1.07 (1.05–1.08)	1,963	1,939	0.99 (0.93–1.05)
White	222,963	229,312	1.03 (1.02–1.03)	94,945	95,849	1.01 (1.00–1.02)