Characteristics | NHSII (n=1884) | DNBC (n=550) |
Type 2 diabetes cases, n (%) | 446 (23.7) | 155 (28.2) |
Length of follow-up (years), mean±SD | 21.3±5.6 | 12.7±1.5 |
Age at the index pregnancy (years), mean±SD | 30.5±5.3 | 31.7±4.6 |
Age at the last follow-up* (years), mean±SD | 56.0±6.3 | 43.8±4.7 |
Family history of diabetes at the index pregnancy†, n (%) | 472 (28.6) | 204 (37.1) |
Pre-pregnancy smoking, n (%) | 55 (8.4%) | 145 (26.4) |
Pre-pregnancy BMI, n (%) | ||
<25 kg/m2 | 335 (51.2) | 209 (38.0) |
25–29 kg/m2 | 171 (26.2) | 149 (27.1) |
≥30 kg/m2 | 148 (22.6) | 150 (27.3) |
*In the NHSII, the last follow-up was the date of last questionnaire return, date of death or date of type 2 diabetes cases, whichever occurred earliest; in DNBC, the last follow-up was the follow-up clinical exam.
†In the NHSII, for women who reported GDM before 1989, it refers to characteristics at 1989.
BMI, body mass index; DNBC, Danish National Birth Cohort; NHSII, Nurses’ Health Study II.