TABLE 1.
Description of covariates at the individual and observational level based on final parity status among HUNT2 and HUNT3 study participants born between 1940 and 1974 (n = 21,312 women)
| Final Parity Status | ||
| Nulliparous | Parous | |
| Women (n) | 1,625 | 19,687 |
| Birth year [median (IQR)] | 1959 (1951–1967) | 1958 (1951–1966) |
| Smoking status at the age of 20 years [n (%)] | ||
| Never smoked daily | 919 (57) | 9,043 (46) |
| Ever smoked daily | 653 (40) | 10,166 (52) |
| Not reported | 53 (3) | 478 (2) |
| Education [n (%)] | ||
| Lower secondary | 309 (19) | 3,164 (16) |
| Upper secondary | 672 (41) | 9,185 (47) |
| Tertiary | 604 (37) | 7,244 (37) |
| Missing | 40 (2) | 94 (0) |
| Family history of CVD [n (%)] | 504 (31) | 6,611 (34) |
| HUNT exam participation [n (%)] | ||
| Only HUNT2 | 751 (46) | 6,827 (35) |
| Only HUNT3 | 288 (18) | 3,333 (17) |
| Both HUNT2 and 3 | 586 (36) | 9,527 (48) |
| Age in years at first birth [median (IQR)] | N/A | 23 (20–26) |
| Births [n (%)] | ||
| 1 | N/A | 2,171 (11) |
| 2 | N/A | 8,804 (45) |
| ≥3 | N/A | 8,712 (44) |
| Breastfeeding length of first birth [n (%)] | ||
| Did not breastfeed | N/A | 1,120 (6) |
| <3 months | N/A | 3,086 (16) |
| 3-6 months | N/A | 5,503 (28) |
| >6 months | N/A | 7,462 (38) |
| Missing | N/A | 2,516 (13) |
| Preterm first birth [n (%)] | N/A | 1,187 (6) |
| Observationsa (n) | 3,329 | 31,743 |
| BMI at HUNT exam [n (%)] | ||
| <25 kg/m2 | 1,674 (50) | 15,728 (50) |
| 25–29.9 kg/m2 | 963 (29) | 10,826 (34) |
| ≥30 kg/m2 | 665 (20) | 5,136 (16) |
| Not available | 27 (1) | 53 (0) |
| Alcohol consumption [n (%)] | ||
| <1 glasses per 2 weeks | 1,162 (35) | 9,277 (29) |
| 1–4 glasses per 2 weeks | 1,167 (35) | 14,797 (47) |
| ≥5 glasses per 2 weeks | 932 (28) | 7,221 (23) |
| Missing | 68 (2) | 448 (1) |
| Vigorous physical activity [n (%)] | ||
| <1 h per week | 1,669 (50) | 18,327 (58) |
| ≥1 h per week | 1,183 (36) | 9,921 (31) |
| Missing | 477 (14) | 3,495 (11) |
| Oral contraceptive use [n (%)] | ||
| Nonuser | 2,024 (61) | 22,716 (72) |
| Current user | 564 (17) | 2,961 (9) |
| Missing | 741 (22) | 6,066 (19) |
a
Observations reflect HUNT survey periods. Individual women who participated in both HUNT2 and HUNT3 contributed two observations.