Table 1.

Baseline characteristics of 381 breast cancer cases and their 381 matched control subjects at baseline

CharacteristicsMedian (5th-95th percentiles) or fraction
ControlsCases
Age at baseline (y)57 (51-64)57 (51-64)
Duration of HRT use (y)*5 (1-21)6 (1-20)
Age at first birth (y)23 (18-31)23 (18-32)
No. births2 (0-4)2 (0-3)
Body mass index (kg/m2)25 (20-33)25 (20-34)
Alcohol intake (g/d)10 (1-43)11 (0-44)
Schooling (y)
    ≤7%3429
    8-10%4948
    ≥11%1823
Use of HRT at inclusion (% yes)5151
Ever use of HRT (% yes)6565
Parous (% yes)8787
Present smoking (% yes)3733
  • NOTE: Values are medians (5th and 95th percentiles) or fraction (%) in each category.

  • * Among ever users of HRT.