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Table 1 Comparison of demographic characteristics and covariates between the initial cohort and the analytical cohort

From: The association of infant feeding patterns with food allergy symptoms and food allergy in early childhood

Variable N = 1542 (%) N = 1387 (%) One-sample test p - value
Race / ethnicity
 White 85.0 87.1 0.92
 Black 3.6 3.7  
 Hispanic 5.5 5.0  
 Asia/Pacific Islander 2.4 2.4  
 Other 1.6 1.8  
 Missing/No answer 1.9 2.0  
Marital status
 Married 79.9 80.0 0.99
 Widowed 0.2 0.1  
 Divorced 1.9 1.9  
 Separated 0.8 0.8  
 Never Married 12.7 12.6  
 Missing/No answer 4.5 4.6  
Delivery mode
 Vaginal (induced and not induced) 70.1 69.8 0.90
 C-Section (planned and unplanned) 29.7 30.1  
 Missing/No answer 0.1 0.1  
Baby’s sex
 Boy 49.9 49.6 0.85
 Girl 49.9 50.3  
 Missing/No answer 0.1 0.1  
Education
 Grade School 0.3 0.3 1.00
 High School 15.5 15.3  
 College 68.6 68.6  
 Post-graduate 11.0 11.0  
 Missing/No answer 4.6 4.8  
Food allergy history
 Maternal - Yes 7.3 7.2 0.99
 No 78.2 78.4  
 Missing/No answer 14.5 14.4  
 Paternal - Yes 5.5 5.6 0.98
 No 80.0 80.0  
 Missing/No answer 14.5 14.4  
Prenatal smoking
 Yes 7.4 7.5 0.99
 No 92.3 92.2  
 Missing/No answer 0.3 0.3  
Household smoking
 Yes 10.6 11.0 0.76
 No 89.2 88.8  
 Missing/No answer 0.1 0.1  
Maternal BMI -pre-pregnancy
 Underweight (<  18.5) 4.2 4.3 0.98
 Normal (18.5 to < 25) 43.1 42.4  
 Overweight (25 to < 30) 25.3 25.5  
 Obese (>  30) 24.5 24.9  
 Missing/No answer 3.0 2.9  
Maternal employment
 Full time 70.2 69.7 1.00
 Part time 12.1 12.1  
 Unemployed 6.5 6.7  
 Missing/No answer 11.2 11.5  
Birth order
 First born 41.4 41.3 1.00
 Second born 18.0 18.0  
 Third born or more 38.8 38.9  
 Missing/No answer 1.8 1.8  
Smoking at Y6FU
 Yes 11.4 11.1 0.99
 No 87.6 87.8  
 Missing/No answer 1.0 1.1  
Infant’s birthweight (pounds) 7.7 7.7 0.33
6-year BMI (kg/m2) 16.6 ± 3.3 16.6 ± 3.2 0.95
  1. Confounders include maternal and paternal history of allergy, pre-pregnancy smoking, baby’s sex, offspring BMI at infancy and 6-years of age, and delivery mode
  2. Categorical variables were tested using chi-square goodness of fit test
  3. Continuous variables were tested using one-sample t-test