Table 1.
Distribution of background characteristics among eligible men and women without any history of cardiovascular disease at baseline
| Characteristics | Women (n = 64,064) |
Men (n = 50,533) |
|---|---|---|
| Age, mean(SD) | 33.2 (4.7) | 35.2 (5.3) |
| Education, N(%) | ||
| Less than high school | 4096 (6.4) | 4106 (8.1) |
| High school | 17,927 (28.0) | 18,821 (37.2) |
| Up to 4 years of college | 26,663 (41.6) | 14,034 (27.8) |
| More than 4 years of college | 15,118 (23.6) | 12,192 (24.1) |
| Missing | 260 (0.4) | 1380 (2.7) |
| BMI, mean(SD) | 23.9 (4.0) | 25.8 (3.2) |
| Missing, N(%) | 1589 (2.5) | 1753 (3.5) |
| Smoking, N(%) | ||
| Never | 33,097 (51.7) | 24,443 (48.4) |
| Former | 16,982 (26.5) | 11,256 (22.3) |
| Current | 13,710 (21.4) | 14,436 (28.6) |
| Missing | 275 (0.4) | 398 (0.8) |
| Self-reported diabetes mellitus, N(%) | ||
| No | 63,709 (99.5) | 50,145 (99.2) |
| Yes | 355 (0.6) | 388 (0.8) |
| Parity, N(%) | ||
| 0 | 29,616 (46.2) | 24,586 (48.7) |
| 1 | 23,219 (36.2) | 17,726 (35.1) |
| 2 | 9099 (14.2) | 6737 (13.3) |
| 3 + | 2130 (3.3) | 1484 (2.9) |
| Endometriosis | ||
| No | 62,990 (98.3) | NA |
| Yes | 1074 (1.7) | NA |
| Ovarian cysts | ||
| No | 60,280 (94.1) | NA |
| Yes | 3784 (5.9) | NA |
| History of preterm birth, N(%) | ||
| No | 61,169 (95.5) | NA |
| Yes | 2895 (4.5) | NA |
| History of pre-eclampsia, N(%) | ||
| No | 62,179 (97.1) | NA |
| Yes | 1885 (2.9) | NA |
| Time-to-pregnancy, N(%) | ||
| 0–3 | 38,691 (60.4) | 30,979 (61.3) |
| 4–12 | 17,510 (27.3) | 13,518 (26.8) |
| More than 12 | 7863 (12.3) | 6036 (11.9) |
| Use contraceptive in the past year, N(%) | ||
| No | 22,401 (35.0) | 17,191 (34.0) |
| Yes | 41,663 (65.0) | 33,342 (66.0) |