Sex hormone | Analysis | ||
Summer | Winter | Across Seasons | |
Parameter estimate (p value) | Parameter estimate (p value) | Parameter estimate (p value) | |
Oestradiol (pmol/l) | 0.005 (0.94) | −0.13 (0.11) | −0.05 (0.54) |
Oestrone (pmol/l) | 0.05 (0.36) | −0.03 (0.61) | 0.05 (0.40) |
Progesterone (nmol/l) | 0.07 (0.46) | 0.14 (0.22) | −0.02 (0.86) |
Prolactin (μg/l) | 0.01 (0.78) | 0.003 (0.94) | −0.05 (0.40) |
Adjusted for age (years), body mass index (kg/m2), menstrual cycle stage (follicular, mid-cycle, luteal) and OC use (yes/no), recent alcohol consumption (drinks per day), recent caffeine consumption (drinks per day), smoking status (current/never/former) and total and moderate-to-heavy recent physical activity levels (hours per week), as appropriate.