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Table 1 Descriptive characteristics of mothers by breastmilk vitamin B12 status at 6 weeks postpartum in Tanzania

From: Breast milk vitamin B12 concentration and incidence of diarrhea and respiratory infections among infants in urban Tanzania: a prospective cohort study

CharacteristicDescriptive statisticsB12 < 310 pmol/L (N = 345)B12 >=310 pmol/L (N = 146)
Treatment arm
 PlaceboN, column  %180 (52.2)64 (43.8)
 MultivitaminsN, column  %165 (47.8)82 (56.2)
Maternal age in yearsMean, SD25.9 (5.1)25.5 (5.0)
Maternal age (years)
 < 20N, column  %49 (16.3)24 (18.3)
 20–24N, column  %89 (29.7)36 (27.5)
 25–29N, column  %85 (28.3)40 (30.5)
 ≥ 30N, column  %75 (25.0)29 (22.1)
Maternal education (years)
 0–4N, column  %39 (11.4)16 (11.1)
 5–7N, column  %219 (63.9)91 (63.2)
 8–11N, column  %64 (18.7)22 (15.3)
 12+N, column  %21 (6.1)15 (10.4)
Maternal BMI at baseline (kg/m2)Mean, SD24.8 (4.1)24.5 (4.1)
Maternal BMI categories (kg/m2)
 Less than 22.0N, column  %77 (24.3)43 (32.3)
 22.0–24.9N, column  %109 (34.4)38 (28.6)
 25.0–29.9N, column  %101 (31.9)37 (27.8)
 30 or moreN, column  %30 (9.5)15 (11.3)
Maternal Hb at 6 weeks (gm/dL)Mean, SD12.0 (1.6)12.5 (1.8)
Maternal Hb categories at 6 weeks (gm/dL)
 Less than 8.5N, column  %13 (3.8)2 (1.4)
 8.5–10.9N, column  %58 (16.8)20 (13.7)
 11.0 or moreN, column  %269 (78.0)121 (82.9)
Infant gender
 FemaleN, column  %165 (47.8)76 (52.4)
 MaleN, column  %180 (52.2)69 (47.6)
Birth weight (kg)Mean, SD3.2 (0.5)3.1 (0.5)
Birth weight categories (kg)
 ≤ 2.0N, column  %7 (2.1)6 (4.3)
 2.001–2.499N, column  %11 (3.3)7 (5.0)
 ≥ 2.5N, column  %320 (94.7)127 (90.7)