Virginia J. VitzthumGillian R. BentleyHilde SpielvogelEsperanza CáceresJonathan ThornburgLisa JonesSarah ShoreKelly R. HodgesRobert T. Chatterton2026-03-222026-03-22200210.1093/humrep/17.7.1906https://doi.org/10.1093/humrep/17.7.1906https://andeanlibrary.org/handle/123456789/44306Citaciones: 78Progesterone levels appear to be influenced by chronic and acute ecological conditions, evidenced by the association with body-size and the probability of ovulation respectively. These findings have implications for understanding cancer aetiology, developing population-appropriate hormonal contraceptives, and modelling the evolution and functioning of the reproductive system.enOvulationLuteal phaseFollicular phasePopulationEndocrinologyInternal medicineAnthropometryMedicineMenstrual cycleBiologySalivary progesterone levels and rate of ovulation are significantly lower in poorer than in better-off urban-dwelling Bolivian womenarticle