Models were developed using the following possible predictors of breastfeeding duration: maternal race, maternal education, paternal education, maternal age, socioeconomic status, 22 marital status, parity, mode of
delivery, previous breastfeeding experience,
timing of feeding method selection, problems with pregnancy / labor /
delivery, breastfeeding goal (weeks), family preference for breastfeeding, paternal preference for breastfeeding, having friends who breastfed, randomization group, 16 plans to return to work, infant's 5 - minute Apgar
score, and infant's age in minutes when first breastfed (first successful latch and feeding).
The following potential confounders were investigated: antenatal depression at 32 - week gestation (Edinburgh Postnatal Depression (EPDS)
score, Cox and Holden 1994), postnatal depression at 8 weeks (Edinburgh Depression Score), maternal education at 32 - week gestation (CSE or below, A level, degree), breastfeeding at 6 months (never, stopped, still feeding), gender (male / female), number of siblings at 6 months, marital conflict at 8 months (Rutter and Quinton 1984), homeowner at 8 months (yes / no), type of dwelling at 8 months (detached, semi-detached, terraced house, flat / maisonette, rooms, other), neighbourhood at 8 months (very good / good / not very good), social class (1 — 6), maternal age at time of delivery, multiple pregnancy at time of delivery and single - parent status at 8 months (single / part
score, Cox and Holden 1994), postnatal depression at 8 weeks (Edinburgh Depression
Score), maternal education at 32 - week gestation (CSE or below, A level, degree), breastfeeding at 6 months (never, stopped, still feeding), gender (male / female), number of siblings at 6 months, marital conflict at 8 months (Rutter and Quinton 1984), homeowner at 8 months (yes / no), type of dwelling at 8 months (detached, semi-detached, terraced house, flat / maisonette, rooms, other), neighbourhood at 8 months (very good / good / not very good), social class (1 — 6), maternal age at time of delivery, multiple pregnancy at time of delivery and single - parent status at 8 months (single / part
Score), maternal education at 32 - week gestation (CSE or below, A level, degree), breastfeeding at 6 months (never, stopped, still feeding), gender (male / female), number of siblings at 6 months, marital conflict at 8 months (Rutter and Quinton 1984), homeowner at 8 months (yes / no), type of dwelling at 8 months (detached, semi-detached, terraced house, flat / maisonette, rooms, other), neighbourhood at 8 months (very good / good / not very good), social class (1 — 6), maternal age at
time of
delivery, multiple pregnancy at
time of
delivery and single - parent status at 8 months (single / partner).