Science2023United Stateshigh confidence

In 2023, 52.7% of US midlife adults aged 35–64 years (about 63.8 million people) reported multiple chronic conditions.

Notes on verification

Corroborated by PMC, PubMed, and ResearchGate mirrors of the same CDC BRFSS-based study (Wiltz et al., 2025); figures consistent across all sources, though ultimately derived from a single primary dataset. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]

Sources