Clinically, women who wish to plan a pregnancy need to have intercourse on their fertile days. This analysis details variations in menstrual cycle characteristics that are not widely known yet have significant implications for health and well-being. Mean variation of cycle length per woman was 0.4 days or 14% higher in women with a BMI of over 35 relative to women with a BMI of 18.5–25. The mean follicular phase length was 16.9 days (95% CI: 10–30) and mean luteal phase length was 12.4 days (95% CI: 7–17). We analysed 612,613 ovulatory cycles with a mean length of 29.3 days from 124,648 users. Menstrual cycle parameters, including menstruation, basal body temperature (BBT) and luteinising hormone (LH) tests as well as age and BMI were collected anonymously from real-world users of the Natural Cycles app. The aim of this study is to describe menstrual cycle characteristics observed from a large database of cycles collected through an app and investigate associations of menstrual cycle characteristics with cycle length, age and body mass index (BMI). The use of apps that record detailed menstrual cycle data presents a new opportunity to study the menstrual cycle.
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