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Trend in asthma prevalence by race: United States, 1982–2013. White and black races were analyzed without regard to Hispanic ethnicity to allow greater comparability of estimates across the entire time period. Asthma period prevalence estimates (1982–1996) are not directly comparable to current asthma prevalence estimates (2001–2013) due to different survey questions and methodology. Source: CDC/NCHS, NHIS.
