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TABLE 1

Demographic Characteristics of Mothers, Firstborn Infants, and Secondborn Infants Participating in the INSIGHT RCT and SIBSIGHT Observational Cohort

Reponsive ParentingControl
Firstborn (n = 57)Secondborn (n = 57)Firstborn (n = 60)Secondborn (n = 60)
Maternal characteristics     
 Age at delivery, y 29.8 (4.4) 32.1 (4.2)a 28.4 (4.0) 31.1 (4.1)a 
 Prepregnancy BMI, kg/m2 24.8 (4.7) 25.8 (5.1)a 25.3 (5.4) 26.0 (6.0)a 
 Gestational wt gain, kg 14.9 (5.6) 11.1 (5.5)a 14.6 (5.1) 11.3 (6.5)a 
 Non-Hispanic White 52 (93) 52 (93) 57 (95) 57 (95) 
 College graduate 43 (75) 43 (75) 46 (77) 46 (77) 
 Married 53 (93) 55 (97) 54 (90) 56 (93) 
Household income     
 <$50 000 6 (11) 3 (5) 11 (18) 5 (8) 
 ≥$50 000 51 (89) 51 (89) 46 (77) 50 (83) 
 Don’t know, refuse to answer, or missing 0 (0) 3 (5) 3 (5) 5 (8) 
Infant characteristics     
 Birth wt, g 3388 (424) 3431 (442) 3449 (412) 3512 (432) 
 Sex, female 30 (53) 35 (61) 32 (53) 32 (53) 
Reponsive ParentingControl
Firstborn (n = 57)Secondborn (n = 57)Firstborn (n = 60)Secondborn (n = 60)
Maternal characteristics     
 Age at delivery, y 29.8 (4.4) 32.1 (4.2)a 28.4 (4.0) 31.1 (4.1)a 
 Prepregnancy BMI, kg/m2 24.8 (4.7) 25.8 (5.1)a 25.3 (5.4) 26.0 (6.0)a 
 Gestational wt gain, kg 14.9 (5.6) 11.1 (5.5)a 14.6 (5.1) 11.3 (6.5)a 
 Non-Hispanic White 52 (93) 52 (93) 57 (95) 57 (95) 
 College graduate 43 (75) 43 (75) 46 (77) 46 (77) 
 Married 53 (93) 55 (97) 54 (90) 56 (93) 
Household income     
 <$50 000 6 (11) 3 (5) 11 (18) 5 (8) 
 ≥$50 000 51 (89) 51 (89) 46 (77) 50 (83) 
 Don’t know, refuse to answer, or missing 0 (0) 3 (5) 3 (5) 5 (8) 
Infant characteristics     
 Birth wt, g 3388 (424) 3431 (442) 3449 (412) 3512 (432) 
 Sex, female 30 (53) 35 (61) 32 (53) 32 (53) 

Values are mean (SD) or n (%). BMI, body mass index. There were no significant differences by study group.

a

Different from firstborns in same group (P < .05).

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