Abstract
This data supports the article Hasegawa, R., Dutra, D.d.A., Presswell, B., Bennett, J., McDougall, C., Buschang, K.E., Chai, X. and Poulin, R. (2026), Does bigger mean sicker? A systematic review and meta-analysis of the intraspecific relationship between host body size and parasite infection across vertebrate taxa. Oikos, e11823. https://doi.org/10.1002/oik.11823.