Table 5.
Luteal phase progesterone levels according to premenopausal physical activity levels among premenopausal women in the Nurses’ Health Study II
| Premenopausal physical activity in MET-hours/week | p for trend | |||||
|---|---|---|---|---|---|---|
| <3 | 3 – <9 | 9 – <18 | 18 – <27 | ≥27 | ||
| N | 122 | 361 | 390 | 267 | 335 | |
| Least squares means of progesterone1 (ng/mL) | ||||||
| Unadjusted | 14.7 | 15.9 | 16.1 | 17.0 | 16.9 | 0.01 |
| Multivariable2 | 13.6 | 14.3 | 14.4 | 15.1 | 14.6 | 0.29 |
| BMI<25kg/m2 | 14.1 | 14.9 | 15.5 | 17.0 | 16.2 | 0.04 |
| BMI≥25kg/m2 | 12.9 | 14.2 | 13.7 | 12.6 | 13.3 | 0.42 |
| p for interaction | 0.07 | |||||
1
Recalibrated using the average batch method
2
Adjusted for age, BMI, time of the day at blood collection, fasting status, luteal days at blood collection, duration of past oral contraceptive use, parity, family history of breast or ovarian cancer, and assay batch