| Relative change in MRI percent water, geometric mean (95 % CI) | |
---|---|---|
Complete dataa | Imputed datab | |
Maternal characteristicsc | n = 303 | n = 490 |
 At participant’s birth only | ||
  Mother’s age at menarche (per 1 SD 1.5 years) | 0.98 (0.96–1.01) | 1.00 (0.98–1.01) |
  Age mother first used OC (per 1 SD 3.1 years) | 1.00 (0.98–1.02) | 1.00 (0.98–1.02) |
  Mother’s height (per 1 SD 6.5 cm) | 1.02 (1.00–1.04) | 1.03 (1.01–1.05) |
  Mother’s age at first birth (per 1 SD 4.7 years) | 0.99 (0.96–1.03) | 0.98 (0.96–1.01) |
  Mother’s age at participant’s birth (per 1 SD 4.5 years) | 1.00 (0.96–1.03) | 1.01 (0.98–1.03) |
  Mother’s pre-pregnancy BMI (per 1 SD 3.0 kg/m2) | 1.01 (0.99–1.03) | 1.01 (0.99–1.03) |
 Mother’s parity at participant’s birth | ||
  0 | 1 (ref) | 1 (ref) |
  1 | 1.04 (0.99–1.10) | 1.02 (0.98–1.06) |
  2+ | 1.00 (0.93–1.08) | 1.00 (0.95–1.06) |
 Mother had a history of breast cancer | ||
  No | 1 (ref) | 1 (ref) |
  Yes | 1.01 (0.95–1.08) | 1.01 (0.96–1.07) |
Maternal characteristics at participant’s birth and at mammographyd | ||
 Mother’s MPD (per 1 SD 13.4 %) | 1.06 (1.01–1.10) | – |
In utero exposurese | n = 107 | n = 490 |
 Placental weight (per 1 SD 133.5 g) | 1.03 (0.99–1.07) | 1.03 (0.99–1.07) |
 Absolute GWG, week 0 to delivery (per 1 SD 3.9 kg) | 0.97 (0.93–1.01) | 1.00 (0.98–1.02) |
 Mother drank alcohol during pregnancy (%) | ||
  No | 1 (ref) | 1 (ref) |
  Yes | 1.01 (0.91–1.11) | 1.00 (0.95–1.06) |
 Mother smoked during pregnancy (%) | ||
  No | 1 (ref) | 1 (ref) |
  Yes | 0.95 (0.89–1.03) | 0.99 (0.96–1.04) |