Characteristics of study participants at baseline in 1994 by prenatal DES exposure
| Characteristic . | Exposed (N = 4,817) . | Unexposed (N = 2,073) . | ||
|---|---|---|---|---|
| . | N (%) . | N (%) . | ||
| Study cohort | ||||
| DESAD | 3,914 (81) | 1,004 (49) | ||
| Dieckmann | 354 (7) | 319 (15) | ||
| New Kids | 264 (6) | 542 (26) | ||
| Horne | 285 (6) | 208 (10) | ||
| Year of birth | ||||
| <1950 | 745 (15) | 479 (23) | ||
| 1950-1954 | 2,067 (43) | 896 (43) | ||
| 1955-1959 | 1,212 (25) | 478 (23) | ||
| ≥1960 | 793 (16) | 220 (11) | ||
| Race | ||||
| White | 4,593 (98) | 1,899 (97) | ||
| Nonwhite | 95 (2) | 54 (3) | ||
| Marital status | ||||
| Ever married or living as married | 3,720 (89) | 1,594 (89) | ||
| Never married | 448 (11) | 204 (11) | ||
| Years of education | ||||
| ≤12 | 548 (14) | 370 (21) | ||
| 13-15 | 912 (23) | 441 (25) | ||
| 16 | 1,423 (36) | 552 (31) | ||
| ≥17 | 1,098 (27) | 408 (23) | ||
| Ever smoked | ||||
| Yes | 1,899 (45) | 946 (51) | ||
| No | 2,334 (55) | 898 (49) | ||
| Mother smoked during pregnancy | ||||
| Yes | 1,457 (36) | 421 (35) | ||
| No | 2,344 (58) | 603 (51) | ||
| Don't know | 268 (6) | 167 (14) | ||
| Ever used oral contraceptives | ||||
| Yes | 3,573 (76) | 1,557 (79) | ||
| No | 1,128 (24) | 413 (21) | ||
| Ever used menopausal hormones | ||||
| Yes | 343 (19) | 193 (11) | ||
| No | 3,649 (91) | 1,585 (89) | ||
| Birthweight, g | ||||
| <3,000 | 1,748 (39) | 447 (26) | ||
| 3,000-3,499 | 1,677 (37) | 701 (41) | ||
| 3,500+ | 1,046 (23) | 543 (32) | ||
| Body mass index, kg/m2 | ||||
| <20 | 625 (16) | 275 (16) | ||
| 20-24 | 2,088 (53) | 893 (51) | ||
| 25-29 | 754 (19) | 374 (21) | ||
| 30+ | 479 (12) | 210 (12) | ||
| Age at menarche, y | ||||
| <12 | 744 (16) | 330 (17) | ||
| 12-13 | 2,848 (61) | 1,155 (59) | ||
| 14+ | 1,108 (24) | 485 (25) | ||
| Parity | ||||
| 0 | 1,560 (36) | 497 (26) | ||
| 1 | 831 (19) | 303 (16) | ||
| 2 | 1,313 (30) | 674 (36) | ||
| 3+ | 648 (15) | 408 (22) | ||
| Age at first birth (among parous), y | ||||
| <25 | 862 (31) | 581 (42) | ||
| 25-29 | 1,019 (36) | 442 (32) | ||
| 30-34 | 656 (23) | 257 (19) | ||
| 35+ | 254 (9) | 105 (8) | ||
| No. mammograms in previous 5-y period | ||||
| 0 | 1,198 (30) | 458 (26) | ||
| 1 | 1,116 (28) | 479 (27) | ||
| 2 or 3 | 1,170 (30) | 554 (32) | ||
| ≥4 | 441 (11) | 257 (15) | ||
| Characteristic . | Exposed (N = 4,817) . | Unexposed (N = 2,073) . | ||
|---|---|---|---|---|
| . | N (%) . | N (%) . | ||
| Study cohort | ||||
| DESAD | 3,914 (81) | 1,004 (49) | ||
| Dieckmann | 354 (7) | 319 (15) | ||
| New Kids | 264 (6) | 542 (26) | ||
| Horne | 285 (6) | 208 (10) | ||
| Year of birth | ||||
| <1950 | 745 (15) | 479 (23) | ||
| 1950-1954 | 2,067 (43) | 896 (43) | ||
| 1955-1959 | 1,212 (25) | 478 (23) | ||
| ≥1960 | 793 (16) | 220 (11) | ||
| Race | ||||
| White | 4,593 (98) | 1,899 (97) | ||
| Nonwhite | 95 (2) | 54 (3) | ||
| Marital status | ||||
| Ever married or living as married | 3,720 (89) | 1,594 (89) | ||
| Never married | 448 (11) | 204 (11) | ||
| Years of education | ||||
| ≤12 | 548 (14) | 370 (21) | ||
| 13-15 | 912 (23) | 441 (25) | ||
| 16 | 1,423 (36) | 552 (31) | ||
| ≥17 | 1,098 (27) | 408 (23) | ||
| Ever smoked | ||||
| Yes | 1,899 (45) | 946 (51) | ||
| No | 2,334 (55) | 898 (49) | ||
| Mother smoked during pregnancy | ||||
| Yes | 1,457 (36) | 421 (35) | ||
| No | 2,344 (58) | 603 (51) | ||
| Don't know | 268 (6) | 167 (14) | ||
| Ever used oral contraceptives | ||||
| Yes | 3,573 (76) | 1,557 (79) | ||
| No | 1,128 (24) | 413 (21) | ||
| Ever used menopausal hormones | ||||
| Yes | 343 (19) | 193 (11) | ||
| No | 3,649 (91) | 1,585 (89) | ||
| Birthweight, g | ||||
| <3,000 | 1,748 (39) | 447 (26) | ||
| 3,000-3,499 | 1,677 (37) | 701 (41) | ||
| 3,500+ | 1,046 (23) | 543 (32) | ||
| Body mass index, kg/m2 | ||||
| <20 | 625 (16) | 275 (16) | ||
| 20-24 | 2,088 (53) | 893 (51) | ||
| 25-29 | 754 (19) | 374 (21) | ||
| 30+ | 479 (12) | 210 (12) | ||
| Age at menarche, y | ||||
| <12 | 744 (16) | 330 (17) | ||
| 12-13 | 2,848 (61) | 1,155 (59) | ||
| 14+ | 1,108 (24) | 485 (25) | ||
| Parity | ||||
| 0 | 1,560 (36) | 497 (26) | ||
| 1 | 831 (19) | 303 (16) | ||
| 2 | 1,313 (30) | 674 (36) | ||
| 3+ | 648 (15) | 408 (22) | ||
| Age at first birth (among parous), y | ||||
| <25 | 862 (31) | 581 (42) | ||
| 25-29 | 1,019 (36) | 442 (32) | ||
| 30-34 | 656 (23) | 257 (19) | ||
| 35+ | 254 (9) | 105 (8) | ||
| No. mammograms in previous 5-y period | ||||
| 0 | 1,198 (30) | 458 (26) | ||
| 1 | 1,116 (28) | 479 (27) | ||
| 2 or 3 | 1,170 (30) | 554 (32) | ||
| ≥4 | 441 (11) | 257 (15) | ||
NOTE: Missing values for each covariate are excluded.