Table 3.
Mean cycle lengths, bleed lengths, per-user cycle length variations, follicular phase lengths and luteal phase lengths in cohorts of cycles by user BMI
| BMI range in kg m−2 | Users (% of total) | Cycles (% of total) | Mean ± std cycle length in days | Mean ± std bleed length in days | Mean ± std per-user cycle length variation in days | Mean ± std follicular phase length in days | Mean ± std luteal phase length in days |
|---|---|---|---|---|---|---|---|
| 15–18.5 | 5040 (4%) | 25,735 (4%) | 29.6 ± 5.2 | 4.2 ± 1.5 | 2.7 ± 2.5 | 16.4 ± 5.4 | 13.1 ± 2.1 |
| 18.5–25 | 83,791 (70%) | 431,667 (72%) | 29.3 ± 5.2 | 4.0 ± 1.5 | 2.7 ± 2.5 | 16.3 ± 5.3 | 12.8 ± 2.1 |
| 25–30 | 20,912 (18%) | 100,228 (17%) | 29.1 ± 5.2 | 3.9 ± 1.4 | 2.6 ± 2.6 | 16.3 ± 5.3 | 12.7 ± 2.2 |
| 30–35 | 6153 (5%) | 26,483 (4%) | 29.3 ± 5.6 | 3.9 ± 1.4 | 2.7 ± 2.7 | 16.6 ± 5.6 | 12.6 ± 2.1 |
| 35–50 | 3145 (3%) | 12,011 (2%) | 29.8 ± 6.0 | 4.0 ± 1.5 | 3.0 ± 3.1 | 17.2 ± 6.0 | 12.4 ± 2.1 |
| All cycles | 124,646 | 612,613 | 29.3 ± 5.2 | 4.0 ± 1.5 | 2.6 ± 2.5 | 16.9 ± 5.3 | 12.4 ± 2.4 |