Table 1.
Anthropometric Characteristics of the Study Population at Birth and at Age 12 Years
| Variable | All (N = 191) | Girls (n = 109) | Boys (n = 82) | P Value a |
|---|---|---|---|---|
| At birth | ||||
| Gestational age, wk | 0.043 | |||
| Mean | 37.7 | 38.1 | 37.2 | |
| Median | 38.0 | 39.0 | 38.0 | |
| Range | 28–42 | 29–42 | 28–42 | |
| Weight, g | 2773 (2666–2881) | 2736 (2586–2886) | 2823 (2669–2978) | 0.482 |
| Weight (SDS) | −1.13 (−1.33 to −0.94) | −1.27 (−1.55 to −1.00) | −0.95 (−1.21 to −0.69) | 0.070 |
| Length, cm | 47.3 (46.8–47.8) | 47.0 (46.3–47.8) | 47.7 (46.9–48.5) | 0.319 |
| Length (SDS) | −0.87 (−1.08 to −0.66) | −1.02 (-1.31 to -0.74) | −0.67 (−0.98 to −0.36) | 0.091 |
| Age 12 years | ||||
| Age, y | 12.26 (12.23–12.29) | 12.27 (12.22–12.31) | 12.26 (12.22–12.29) | 0.970 |
| Weight, kg | 44.13 (42.61–45.65) | 44.35 (42.27–46.43) | 43.83 (41.57–46.09) | 0.835 |
| BMIadj, kg/m2 | 21.44 (20.89–21.99) | 20.94 (20.26–21.61) | 22.10 (21.21–23.00) | 0.060 |
| Height, cm | 153.2 (152.1–154.2) | 153.9 (152.4–155.4) | 152.2 (150.5–153.8) | 0.208 |
| Height (SDS) | 0.26 (0.12–0.41) | 0.16 (−0.04 to 0.36) | 0.40 (0.18–0.62) | 0.061 |
| WHtR | 0.002 | |||
| Mean | 0.43 | 0.42 | 0.44 | |
| Median | 0.42 | 0.41 | 0.43 | |
| Range | 0.35–0.63 | 0.35–0.63 | 0.36–0.63 | |
| Pubertal developmentb (early or late stage), no. | 106/85 | 38/71 | 68/14 | <0.001c |
| Tanner B/G stage, no. | <0.001c | |||
| 1 | 40 | 14 | 26 | |
| 2 | 66 | 24 | 42 | |
| 3 | 50 | 38 | 12 | |
| 4 | 27 | 25 | 2 | |
| 5 | 8 | 8 | 0 |
Data are given as mean (95% CI) or, for the variables with skew distributions, as mean, median and range.
Abbreviations: B/G, breast/genital development; SDS, SD score.
a
Mann-Whitney U test for the differences between the girls and boys.
b
Early stage of puberty: breast or genital development scores, 1–2; late stage of puberty: breast or genital development scores 3–5.
c
χ 2 test for the differences between the girls and boys.