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