Science2013-2023United Stateshigh confidence

Among US young adults, chronic-condition prevalence increased from 52.5% in 2013 to 59.5% in 2023, and multiple chronic condition prevalence increased from 21.8% to 27.1% over the same period.

Notes on verification

Confirmed verbatim by peer-reviewed CDC PCD study (Watson et al. 2025) indexed on PubMed/PMC, with consistent figures across multiple independent sources including a secondary industry citation. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]

Sources