Mapping ENDES-Based Research in Scopus: Scientific Output, Reporting, and Analytical Overlap, 2001–2026

National health surveys generate reusable population-based evidence, but repeated use may produce thematic concentration, heterogeneous methodological reporting, and analytical overlap. This revised bibliometric and meta-research study audited 328 Scopus records retrieved for Peru’s Demographic and Family Health Survey (ENDES), excluded 14 records without eligible analytical ENDES use, and analyzed 314 publications. Matched full texts were available for 284 articles. Publications spanned 2001–2026 and increased mainly from 2019 onward. The most frequent thematic domains were Cardiometabolic health/adiposity (n = 93), Maternal/reproductive health (n = 77), and Child nutrition and growth (n = 39). The most reused ENDES years after validation were 2019 (n = 110), 2018 (n = 81), 2017 (n = 76), 2021 (n = 68), and 2022 (n = 66). Initial ENDES-year extraction showed a 25.4% false-positive rate, a 45.8% false-negative rate, and 28.3% complete article-level agreement. At a pairwise similarity threshold of 0.80, 32 analytical-overlap clusters were identified. The findings characterize the Scopus-indexed and Scopus-retrieved ENDES corpus and emphasize the need for explicit corpus auditing, transparent coding rules, validated survey-year extraction, and reproducible scripts.