male	indicates whether the infant was male
dead	indicates whether infant died
married	indicates whether the mother was married at the time of giving birth
sub-15 years	indicates whether the mother was 14 years or younger at the time of giving birth
15–17 years	indicates whether the mother was 15–17 years old at the time of giving birth
18–19 years	indicates whether the mother was 18 or 19 years old at the time of giving birth
35 years+	indicates whether the mother was 35 years or older at the time of giving birth
EdMis	indicates whether the mother's education was missing
EdLow	indicates whether the mother had 11 or fewer years of education
EdHS	indicates whether the mother had 12 years of education, but not more