Table 1: Infant and parental characteristics of the subjects.

VariableBoysGirls
Mean (SD)Mean (SD)

No. of subjects [ 𝑛 (%)]73 (51.8)68 (48.2)
Infant characteristics
 Firstborn [ 𝑛 (%)]20 (30.3)24 (35.8)
 Birth weight (g)3807 (360)3750 (369)
 Birth length (cm)52.2 (1.52)51.7 (1.77)
 Birth head circumference (cm)36.2 (1.22)35.4 (1.14)*
 Weight at 6 mo (kg)8.4 (0.7)7.9 (0.75)*
 Length at 6 mo (cm)70.1 (1.7)67.9 (1.7)*
 Weight at 12 mo (kg)10.37 (1.0)9.76 (0.99)*
 Length at 12 mo (cm)78.0 (2.25)76.17 (2.60)*
 Hb at 12 mo (g/L)120.96 (8.19)120.28 (8.28)
 MCV at 12 mo (fl)76.71 (3.41)77.69 (3.09)
 log SF at 12 mo (μg/L)3.31 (0.63)3.57 (0.46)*
Parental and socioeconomic characteristics
 Mother's BMI (kg/m2)24.3 (6.09)24.6 (5.38)
 Father's BMI (kg/m2)26.4 (4.14)25.1 (5.60)
 Mother's age (years)32.0 (5.25)30.3 (4.58)
 Father's age (years)34.1 (6.13)33.4 (5.22)
 Mother’s ≥12 y of schooling [ 𝑛 (%)]56 (82.4)57 (86.4)
 Father’s ≥12 y of schooling [ 𝑛 (%)]51 (77.3)51 (78.5)
 Smoker in the household [ 𝑛 (%)]14 (21.5)13 (20)
 Reside in capital and surroundings [ 𝑛 (%)]60 (62.5)60 (60)
 Marital status (married/partnership) [ 𝑛 (%)]63 (96.9)62 (98.4)

*Significantly different from boys. 𝑃 0 . 0 5 (indepentent 𝑡 -test).
Median and interquartile range (IQR).