First stage | Second stage | |
---|---|---|
N | 1999 | 1496 |
Age (years) | 37.5±11.1 | 37.3±10.8 |
Body mass index (kg/m2) | 23.3±3.4 | 23.4±3.3 |
Smoking status (%) | ||
Non-smoker (%) | 984 (49.2) | 725 (48.5) |
Smoker (%) | 1015 (50.8) | 771 (51.5) |
Testosterone (ng/mL) | 6.3±1.9 | 6.3±2.4 |
Oestradiol (pg/mL)* | 3.5±0.3 | 2.7±0.1 |
FSH (mIU/mL)* | 1.7±0.6 | 1.7±0.6 |
LH (mIU/mL) | 5.6±2.7 | 5.6±3.0 |
SHBG (nmol/L)* | 3.6±0.5 | 3.8±0.5 |
Data shown with±are given as mean±SD unless indicate otherwise.
*Variables were log-transformed.
FSH, follicle-stimulating hormone; LH, luteinising hormone; SHBG, sex hormone binding globulin.