Table 1.

Descriptive statistics for health outcome data for Harris County and the City of Houston (June–September, 2000–2015).

Health outcome groups	ICD-9-CM codes	ICD-10 codes	Harris Countya		City of Houstonb
			Total deaths ($n$)	Total EHAs ($n$)	Total deaths ($n$)	Total EHAs ($n$)	Mean daily deaths ($n$)	Mean daily EHAs ($n$)
Heat-related (HEAT)	390–519; 580–593; 992	I00–I99; J00–J99; N00–N20; T67.0–T67.9, X30	32,043	54,152	23,809	42,395	12	35
Circulatory (CIRC)	390–459	I00–I99	24,513	34,484	18,330	27,277	9	22
Respiratory (RESP)	460–519	J00–J99	5,806	14,832	4,159	11,320	2	9

Note: CBG, U.S. Census block group; CIRC, diseases of the circulatory system; EHA, emergency hospital admissions; HEAT, heat-related outcomes; ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification diagnostic codes; ICD-10, International Classification of Diseases, 10th Revision diagnostic codes; RESP, diseases of the respiratory system.

^aData are from all valid CBGs in the study area ($n=\mathrm{2,038}$).

^bData are from all valid CBGs in the study area ($n=\mathrm{1,522}$).