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Mother’s age in years* -
Previous children in the home (= 1 vs 0) -
Infant age in months* -
Infant sex -
Mother’s highest level of education (less than college vs completed college or university) -
Mother born in Canada (yes vs no) -
English is the primary language spoken at home (yes vs no) -
Mother drinks alcohol (yes vs no) -
Mother smokes cigarettes (yes vs no)
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Household income (< $60 000 vs = $60 000) -
Access to a car (yes vs no) -
Access to bus (yes vs no) -
Any access difficulties (yes vs no) -
Social support (score < 10th percentile vs = 10th percentile) -
Financial strain (score < 90th percentile vs = 90th percentile) -
Mother is working full-time (yes vs no) -
Marital status
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Preterm infant < 37 weeks’ gestation (yes vs no) -
SGA defined as birth weight < 10th percentile for gestational age (yes vs no) -
Colic† (Ames score = 3 vs < 3)
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