Table 2.
Association between selected characteristics and infant’s percent fat mass at two weeks of age
| Variables | All (n=209) |
Boys (n=115) |
Girls (n=94) |
|||
|---|---|---|---|---|---|---|
| β | p-value | β | p-value | β | p-value | |
| Maternal %FM | 0.10 | 0.0029 | 0.10 | 0.0265 | 0.09 | 0.0441 |
| Maternal age (years) | −0.06 | 0.3662 | 0.01 | 0.9299 | −0.16 | 0.1244 |
| Maternal race | ||||||
| Caucasian | Reference | |||||
| Non-Caucasian | 1.19 | 0.0773 | 1.91 | 0.0489 | 0.35 | 0.7134 |
| Family Income | ||||||
| ≤ $60,000 | Reference | |||||
| > $60,000 – $90,000 | −0.10 | 0.8600 | −0.26 | 0.7464 | −0.35 | 0.6956 |
| ≥ $90,000 | −0.23 | 0.6970 | 0.11 | 0.8853 | −0.84 | 0.3680 |
| GWG (kg) | 0.02 | 0.6757 | 0.01 | 0.8989 | 0.06 | 0.4625 |
| Gestational weight gain above IOM | 0.37 | 0.4710 | 0.16 | 0.8064 | 0.58 | 0.4560 |
| Total AC/day | 0.00 | 0.5773 | 0.00 | 0.4222 | −0.00 | 0.7985 |
| REE (kcal/kg of FFM0.74) | 0.03 | 0.2345 | 0.03 | 0.4644 | 0.04 | 0.2939 |
| Gestational age (weeks) | 0.36 | 0.2037 | 0.59 | 0.0946 | 0.04 | 0.9297 |
| Delivery mode | ||||||
| Vaginal Induced | Reference | |||||
| Vaginal | 1.35 | 0.0265 | 0.68 | 0.3781 | 2.02 | 0.0438 |
| C-section | 1.41 | 0.0221 | 1.31 | 0.0991 | 1.37 | 0.1650 |
| Newborn sex | ||||||
| Male | Reference | |||||
| Female | 1.06 | 0.0295 | ||||
| Feeding mode at age 2 weeks | ||||||
| Formula or mixed-fed | Reference | |||||
| Exclusively breastfed | 1.08 | 0.0430 | 0.83 | 0.2469 | 1.51 | 0.0540 |
%FM=percent fat mass, GWG=gestational weight gain, IOM=Institute of Medicine, AC=activity counts, REE=resting energy expenditure, FFM=fat free mass.
(mother-offspring pairs, n=209)