Asthma-related mortality in the United States, 1999 to 2015: A multiple causes of death analysis.

BACKGROUND: Asthma mortality based on the underlying cause of death (UCOD) underestimates disease burden.

OBJECTIVE: To analyze asthma mortality in the United States from 1999 to 2015 and the pattern of reporting of asthma and its comorbidities in death certificates, using multiple cause of death (MCOD) records.

METHODS: All 156,517 death certificates with any mention of asthma were analyzed for 1999 to 2015. Asthma was defined by International Classification of Diseases, 10th Revision code J45 based on the UCOD or MCOD. Annual age-adjusted asthma death rates were computed according to age, sex, and race/ethnicity. The 6,304 MCOD coded status asthmaticus cases (J46) were also examined.

RESULTS: From 1999 to 2015 a total of 59,067 deaths with a UCOD of asthma occurred; 37,832 deaths occurred in females and 21,235 in males (female-male ratio = 1.78). A total of 156,517 deaths with MCOD of asthma occurred; 101,371 deaths occurred in females and 55,146 in males (female-male ratio = 1.83). Hence, 37.7% of deaths with any mention of asthma had asthma as the UCOD (37.3% in females and 38.45% in males). Of these deaths, 41.7% occurred in non-Hispanic blacks and 36% in non-Hispanic whites. Between 1999 and 2015, age-adjusted MCOD death rates changed as follows: 38.1% in Hispanic white females, 34.1% in non-Hispanic black females, 15.1% in non-Hispanic white females, 28.5% in Hispanic white males, 21.3% in non-Hispanic black males, and 25.0% in non-Hispanic white males. Non-Hispanic black females and males had the highest MCOD and UCOD rates throughout the period.

CONCLUSION: Among deaths with any mention of asthma, asthma was chosen as the UCOD most often in non-Hispanic black males and least often in non-Hispanic white females. Age-adjusted MCOD rates decreased most in non-Hispanic white males and least in non-Hispanic white females.