Table 2.

Characteristics of study participants at baseline in 1994 by prenatal DES exposure

CharacteristicExposed (N = 4,817)
Unexposed (N = 2,073)
N (%)N (%)
Study cohort
    DESAD3,914 (81)1,004 (49)
    Dieckmann354 (7)319 (15)
    New Kids264 (6)542 (26)
    Horne285 (6)208 (10)
Year of birth
    <1950745 (15)479 (23)
    1950-19542,067 (43)896 (43)
    1955-19591,212 (25)478 (23)
    ≥1960793 (16)220 (11)
Race
    White4,593 (98)1,899 (97)
    Nonwhite95 (2)54 (3)
Marital status
    Ever married or living as married3,720 (89)1,594 (89)
    Never married448 (11)204 (11)
Years of education
    ≤12548 (14)370 (21)
    13-15912 (23)441 (25)
    161,423 (36)552 (31)
    ≥171,098 (27)408 (23)
Ever smoked
    Yes1,899 (45)946 (51)
    No2,334 (55)898 (49)
Mother smoked during pregnancy
    Yes1,457 (36)421 (35)
    No2,344 (58)603 (51)
    Don't know268 (6)167 (14)
Ever used oral contraceptives
    Yes3,573 (76)1,557 (79)
    No1,128 (24)413 (21)
Ever used menopausal hormones
    Yes343 (19)193 (11)
    No3,649 (91)1,585 (89)
Birthweight, g
    <3,0001,748 (39)447 (26)
    3,000-3,4991,677 (37)701 (41)
    3,500+1,046 (23)543 (32)
Body mass index, kg/m2
    <20625 (16)275 (16)
    20-242,088 (53)893 (51)
    25-29754 (19)374 (21)
    30+479 (12)210 (12)
Age at menarche, y
    <12744 (16)330 (17)
    12-132,848 (61)1,155 (59)
    14+1,108 (24)485 (25)
Parity
    01,560 (36)497 (26)
    1831 (19)303 (16)
    21,313 (30)674 (36)
    3+648 (15)408 (22)
Age at first birth (among parous), y
    <25862 (31)581 (42)
    25-291,019 (36)442 (32)
    30-34656 (23)257 (19)
    35+254 (9)105 (8)
No. mammograms in previous 5-y period
    01,198 (30)458 (26)
    11,116 (28)479 (27)
    2 or 31,170 (30)554 (32)
    ≥4441 (11)257 (15)
  • NOTE: Missing values for each covariate are excluded.