TABLE 1. Characteristics of the Population at Age 9 Years According to Birth Weight Group.
| Characteristic | Birth Weight < 3.2 kg |
Birth Weight 3.2-3.6 kg |
Birth Weight > 3.6 kg |
P |
|---|---|---|---|---|
| N | 50 | 69 | 47 | |
| Female, % | 35 | 46 | 19 | .004 |
| BMI, mean ± SE, kg/m2 | 16.8 ± 0.4 | 17.4 ± 0.3 | 18.1 ± 0.2 | .084 |
| Height, mean ± SE, cm | 137.8 ± 0.9 | 140.4 ± 0.8 | 141.2 ± 0.9 | .020 |
| Weight, mean ± SE, kg | 32.1 ± 0.9 | 34.5 ± 0.9 | 36.3 ± 1.2 | .021 |
| Systolic BP, mean ± SE, mm Hg | 103.6 ± 1.3 | 105.5 ± 1.2 | 104.6 ± 1.6 | .581 |
| Diastolic BP, mean ± SE, mm Hg | 58.9 ± 0.9 | 58.7 ± 0.7 | 58.7 ± 0.9 | .984 |
| Heart rate, mean ± SE, bpm | 80.2 ± 1.4 | 78.2 ± 1.2 | 79.6 ± 1.4 | .552 |
| Arteriolar optimality deviance, mean ± SE | 0.094 ± 0.011 | 0.076 ± 0.007 | 0.070 ± 0.007 | .132 |
| Arteriolar bifurcation angle, mean ± SE | 80.0 ± 1.9 | 79.6 ± 1.7 | 76.3 ± 12.1 | .375 |
| Arteriolar simple tortuosity, mean ± SE | 0.031 ± 0.004 | 0.025 ± 0.003 | 0.018 ± 0.002 | .031 |
| Arteriolar LDR, mean ± SE | 13.1 ± 0.5 | 13.5 ± 0.4 | 12.7 ± 0.5 | .470 |
| Arteriolar diameter, mean ± SE, pixels | 15.7 ± 1.5 | 15.7 ± 1.4 | 15.8 ± 1.5 | .873 |
| Venular diameter, mean ± SE, pixels | 20.1 ± 3.7 | 19.5 ± 3.3 | 19.1 ± 3.2 | .310 |
| AVR, mean ± SE | 0.90 ± 0.02 | 0.91 ± 0.02 | 0.91 ± 0.01 | .584 |
LDR indicates length/diameter ratio; AVR, arteriolar/venular diameter ratio; bpm, beats per minute.