Age-adjusted association of the ponderal index at birth categorized into thirds with fasting insulin and glucose levels and insulin sensitivity, stratified by cardiorespiratory fitness (ml · kg−1 · min−1 · 40th percentile)
| Ponderal index (thirds) | Vo2max <28.6 ml · kg−1 · min−1 (n = 164) | Vo2max ≥28.6 ml · kg−1 · min−1 (n = 247) |
|---|---|---|
| Fasting serum insulin levels (mU/l) | ||
| <26.31 kg/m3 | 15.0 (13.1–16.9) | 9.3 (8.3–10.2) |
| 26.31–27.72 kg/m3 | 11.8 (9.7–13.8) | 9.7 (8.8–10.7) |
| >27.72 kg/m3 | 12.3 (9.9–13.5) | 9.0 (8.1–9.9) |
| P value, lowest versus upper two thirds | 0.009 | 0.86 |
| P for the interaction between fitness and thinness at birth | 0.009 | |
| Fasting blood glucose levels (mmol/l) | ||
| <26.31 kg/m3 | 4.85 (4.72–4.98) mg/dl, 83.4 | 4.58 (4.47–4.68) mg/dl, 82.5 |
| 26.31–27.72 kg/m3 | 4.60 (4.46–4.74) mg/dl, 82.9 | 4.56 (4.45–4.68) mg/dl, 82.2 |
| >27.72 kg/m3 | 4.50 (4.36–4.63) mg/dl, 81.1 | 4.50 (4.39–4.60) mg/dl, 81.1 |
| P value, lowest versus upper two-thirds | <0.001 | 0.48 |
| P for the interaction between fitness and thinness at birth | 0.020 | |
| Insulin sensitivity index | ||
| <26.31 kg/m3 | 0.457 (0.444–0.470) | 0.501 (0.488–0.513) |
| 26.31–27.72 kg/m3 | 0.475 (0.461–0.488) | 0.502 (0.490–0.515) |
| >27.72 kg/m3 | 0.481 (0.468–0.495) | 0.510 (0.498–0.522) |
| P value, lowest versus upper two-thirds | 0.014 | 0.44 |
| P for the interaction between fitness and thinness at birth | 0.15 |
Data are means (95% CI).