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Table 1

Characteristics of NHS II participants according to lifetime duration of lactation (N = 4,372)

0 months>0 to 6 months>6 to 12 months>12 to 24 months>24 months
(n = 766)(n = 770)(n = 871)(n = 1,082)(n = 883)
Age at index GDM, years 32.1 ± 4.8 32.5 ± 4.8 32.3 ± 4.7 32.2 ± 4.7 33.2 ± 4.8 
White 89 88 90 92 94 
Family history of diabetes 30 28 25 24 24 
Age at first birth, years 27.3 ± 5.1 28.6 ± 5.4 28.4 ± 5.2 27.5 ± 4.8 26.1 ± 4.1 
Prepregnancy BMI, kg/m2 22.3 ± 4.4 21.7 ± 3.7 21.2 ± 3.1 21.0 ± 3.2 21.0 ± 2.7 
Parity in 1991 1.9 ± 0.9 1.8 ± 0.8 1.9 ± 0.8 2.3 ± 0.9 3.0 ± 1.1 
Ever smoking in 1991 38 37 34 31 29 
AHEI in 1991 40.7 ± 10.6 42.5 ± 10.5 43.7 ± 10.1 43.7 ± 10.7 43.1 ± 10.5 
Total activity in 1991, MET-h/week 17.0 ± 23.5 16.4 ± 19.7 15.9 ± 18.2 18.3 ± 22.1 17.3 ± 21.7 
0 months>0 to 6 months>6 to 12 months>12 to 24 months>24 months
(n = 766)(n = 770)(n = 871)(n = 1,082)(n = 883)
Age at index GDM, years 32.1 ± 4.8 32.5 ± 4.8 32.3 ± 4.7 32.2 ± 4.7 33.2 ± 4.8 
White 89 88 90 92 94 
Family history of diabetes 30 28 25 24 24 
Age at first birth, years 27.3 ± 5.1 28.6 ± 5.4 28.4 ± 5.2 27.5 ± 4.8 26.1 ± 4.1 
Prepregnancy BMI, kg/m2 22.3 ± 4.4 21.7 ± 3.7 21.2 ± 3.1 21.0 ± 3.2 21.0 ± 2.7 
Parity in 1991 1.9 ± 0.9 1.8 ± 0.8 1.9 ± 0.8 2.3 ± 0.9 3.0 ± 1.1 
Ever smoking in 1991 38 37 34 31 29 
AHEI in 1991 40.7 ± 10.6 42.5 ± 10.5 43.7 ± 10.1 43.7 ± 10.7 43.1 ± 10.5 
Total activity in 1991, MET-h/week 17.0 ± 23.5 16.4 ± 19.7 15.9 ± 18.2 18.3 ± 22.1 17.3 ± 21.7 

Values are means ± SD or percentages and are standardized to the age distribution of the study population. AHEI, Alternate Healthy Eating Index.

Value is not age adjusted.

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