Effects of population age structure on parenteral antimicrobial use estimations

Author:

Koizumi Ryuji,Kusama Yoshiki,Asai Yusuke,Tsuzuki Shinya,Aoyagi Kensuke,Ishikane Masahiro,Muraki Yuichi,Ohmagari Norio

Abstract

AbstractAntimicrobial use (AMU) is conventionally reported as unadjusted defined daily doses (DDDs) or population-adjusted DDDs per 1000 inhabitants per day (DID). DID is frequently used to monitor national AMU trends, this metric does not intrinsically take temporal changes in population age structure into account. We examined the effects of population age structure on DID estimates of parenteral AMU in Japan, and predicted future trends in DDDs based on population projections. Parenteral AMU data from 2013 to 2018 were acquired from a national claims database. We assessed temporal trends in parenteral AMU by age group (children aged < 15 years, working-age persons aged 15–64 years, and older persons aged ≥ 65 years) using both DID and DDDs. In addition, we modeled DDD predictions based on age-specific population projections from 2019 to 2030. DID values for older persons were 8.08–10.15 times and 5.43–5.63 times higher than in children and working-age persons, respectively. DID was stable, but DDDs increased in older persons. The prediction models showed that DDDs will continue to increase until 2030 if DID remains steady or decreases. DID estimates were skewed by the older population. More rigorous antimicrobial stewardship efforts targeting geriatric care are needed to counter the aging-associated increase in AMU.

Funder

Ministry of Health, Labour and Welfare

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

Reference27 articles.

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