Table 1.
Characteristics of Nurses’ Health Study II – Diabetes and Women’s Health Study participants according to lifetime duration of lactation (n=689)*
| Lifetime duration of lactation (months) | ||||
| 0 | 1–12 | 12–24 | >24 | |
| n | 80 | 234 | 181 | 194 |
| Age at index GDM†, years | 32.1±4.8 | 32.6±4.7 | 32.6±5.2 | 33.1±4.8 |
| White | 88 | 93 | 92 | 94 |
| Family history of diabetes | 33 | 28 | 28 | 28 |
| Parity | 1.9±0.9 | 1.7±0.8 | 2.2±0.8 | 3.0±1.3 |
| Age at first birth, years | 26.8±5.6 | 29.5±5.7 | 28.0±5.2 | 26.3±4.2 |
| Prepregnancy body mass index, kg/m2 | 22.3±4.6 | 21.1±3.2 | 20.9±2.8 | 20.8±2.4 |
| Ever-smoking status in 1991 | 30 | 27 | 25 | 29 |
| Alternate Healthy Eating Index in 1991 | 42.0±9.9 | 45.3±11.2 | 45.4±10.1 | 43.9±9.8 |
| Total activity in 1991, METs/week | 14.6±14.7 | 16.9±18.2 | 17.5±17.7 | 16.5±21.1 |
*Values are means±SD or percentages and are standardized to the age distribution of the study population.
†Value is not age adjusted.
GDM, gestational diabetes; MET, metabolic equivalent task.