Physical working capacity (watt/kg body weight × minutes) in 218 VLBW boys and expected numbers calculated from total population
| Group | Definition | Observed | Expected |
|---|---|---|---|
| 1 | <1.9 | 0 | 0.36 |
| 2 | 2.0–2.4 | 2 | 1.47 |
| 3 | 2.5–2.9 | 6 | 5.20 |
| 4 | 3.0–3.4 | 18 | 14.87 |
| 5 | 3.5–3.9 | 42 | 36.76 |
| 6 | 4.0–4.3 | 126 | 94.98 |
| 7 | 4.4–4.7 | 3 | 20.68 |
| 8 | 4.8–5.1 | 10 | 19.72 |
| 9 | 5.2– | 11 | 22.95 |