Table 1.
Characteristics of the sample of mothers and their infants (n 1776) from the Infant Feeding Practices Study 2 (USA)
| % or Mean | n or sd | |
|---|---|---|
| Infant characteristics | ||
| Sex (% female) | 50·2 | 890 |
| Gestational age (weeks) | 39·4 | 1·3 |
| Birth weight (kg) | 3·5 | 0·5 |
| Age at solid food introduction (months) | 5·1 | 1·7 |
| Maternal/familial characteristics | ||
| Age at study entry (years) | 28·9 | 5·4 |
| Pre-pregnancy BMI (kg/m2) | 26·6 | 6·7 |
| Parity (number of children) | 1·1 | 1·2 |
| Federal assistance (% participating) | 40·0 | 710 |
| Annual family income level | ||
| <$US 20 000 | 13·3 | 237 |
| $US 20 000–39 999 | 29·5 | 524 |
| $US 40 000–59 999 | 23·7 | 421 |
| $US 60 000–99 999 | 25·5 | 453 |
| ≥$US 100 000 | 8·0 | 141 |
| Level of education | ||
| Did not complete high school | 2·7 | 48 |
| High-school degree | 15·8 | 281 |
| Some college/vocational degree | 37·6 | 668 |
| Bachelor’s or graduate degree | 36·4 | 647 |
| Not reported or no data | 7·4 | 132 |
| Race/ethnicity | ||
| White | 84·5 | 1501 |
| Black | 4·0 | 71 |
| Asian/Pacific Islander | 2·8 | 49 |
| Other | 5·9 | 106 |
| Not reported or no data | 2·8 | 49 |
| Marital status | ||
| Married | 73·4 | 1304 |
| Widowed | 0·3 | 5 |
| Divorced | 2·7 | 49 |
| Separated | 1·2 | 21 |
| Never married | 15·4 | 274 |
| Not reported or no data | 7·0 | 123 |
| Prenatal feeding intentions | ||
| Breast-feeding only | 58·4 | 1036 |
| Formula-feeding only | 13·7 | 244 |
| Both breast- and formula-feeding | 24·4 | 433 |
| Undecided | 3·3 | 59 |
| Not reported or no data | 0·2 | 4 |