. 2017 Aug 10;186(6):730–735. doi: 10.1093/aje/kwx141

Table 1.

Categorization of Subpopulation Based on Individual Characteristics, Population in These Groups, and Population Exposed to at Least 1 Smoke Wave in Each Subpopulation in Western US Counties, 2004–2009

Individual Characteristic	Average Population		Average No. Exposed to >1 Smoke Wave	% Subpopulation Exposed to >1 Smoke Wave^b	Average No. of Smoke-Wave Days per Year	Average Smoke Wave Intensity, μg/m³
Individual Characteristic	No.^a	% of Total Population	Average No. Exposed to >1 Smoke Wave	% Subpopulation Exposed to >1 Smoke Wave^b	Average No. of Smoke-Wave Days per Year	Average Smoke Wave Intensity, μg/m³
Age, years
65–74	2,700,367	54.5	1,604,366	59.4	1.51	44.06
75–84	1,643,695	33.1	966,542	58.8	1.56	44.10
>84	614,865	12.4	391,847	63.7	1.62	44.13
Sex
Female	2,743,008	55.3	1,641,338	59.8	1.55	44.11
Male	2,215,919	44.7	1,321,416	59.6	1.52	44.06
Race
Black	157,934	3.2	115,933	73.4	1.77	43.95
White	4,110,641	82.9	2,302,364	56.0	1.47	44.01
Other	690,352	13.9	544,457	78.9	1.91	44.45

^a The average Medicare population in each subpopulation during the study period. The Medicare population changes over time; values here represent the population size on an average day during the study period.

^b Interpretation example: Of people 65–74 years of age, 59.4% were exposed to smoke waves during the study period compared with 58.8% of people 75–84 years of age.