Table 2 Maternal and infant descriptive statistics for the sample at birth and at 3Â months
From: Validity of anthropometric equations to estimate infant fat mass at birth and in early infancy
|  | Birth (n = 95) | 3 months (n = 63) |
|---|---|---|
Maternal age (years) | 28.9 ± 4.8 | 29.9 ± 4.0 |
Maternal pre-pregnancy BMI (kg/m2) | 25.8 ± 6.1 | 25.4 ± 5.6 |
Maternal gestational weight gain (kg) | 15.6 ± 6.0 | 15.2 ± 5.5 |
Gestational age (wks) | 39.24 ± 2.8 | 39.20 ± 3.3 |
Birthweight (g) | 3497.5 ± 404.6 | 3539.0 ± 445.2 |
Birth length (cm) | 50.4 ± 2.1 | 50.0 ± 4.8 |
Male (%) | 42 (44.2%) | 26 (41.3%) |
Infant age (days) | 2.3 ± 1.3 | 117.2 ± 23.2 |
Ethnicity | ||
 White | 68 (71.6) | 51 (81.0) |
 African-American | 14 (14.7) | 5 (7.9) |
 Hispanic | 8 (8.4) | 4 (6.3) |
 Asian | 5 (5.3) | 3 (4.8) |
Body weight at assessment (g) | 3272 ± 388.2 | 6595.1 ± 841.4 |
Length at assessment (cm) | 50.4 ± 2.1 | 63.9 ± 4.4 |
Skinfolds | ||
 Triceps (mm) | 5.6 ± 1.5 | 11.1 ± 2.9 |
 Biceps (mm) | 4.4 ± 1.2 | 7.4 ± 2.1 |
 Subscapular (mm) | 5.3 ± 1.4 | 7.9 ± 2.0 |
 Thigh (mm) | 7.7 ± 1.9 | 20.2 ± 4.4 |
Percentage body fat by criterion (%fat) | 11.2 ± 4.3 | 25.0 ± 5.1 |
Fat mass by criterion (kg) | 0.374 ± 0.17 | 1.664 ± 0.44 |
Fat-free mass by criterion (kg) | 2.897 ± 0.29 | 4.93 ± 0.63 |
Values are mean ± SD. | ||