| Background details | London, UK | Skövde, Sweden | Toronto, Canada | Total population |
| Subjects n (males %) | 293 (47) | 102 (45) | 102 (52) | 497 (48) |
| White n (%) | 220 (75) | 102 (100) | 76 (75) | 398 (80) |
| Test occasions n | 443 | 102 | 114 | 659 |
| Age years | 5.2 (0.05–16.0) | 17.9 (4.5–18.7) | 1.6 (0.23–18.9) | 5.8 (0.05–18.9) |
| Weight kg | 19.1 (3.7–71.9) | 63.0 (20.5–101.0) | 11.1 (5.2–98.7) | 20.7 (3.7–101.0) |
| Weight z-score# | 0.22±1.00 | 0.59±0.93 | 0.24±1.14 | 0.28±1.02 |
| Height cm | 110.5 (52.5–183.0) | 169.3 (113.2–196.5) | 82.8 (60.0–185.5) | 114.7 (52.5–196.5) |
| Height z-score# | 0.39±1.04 | 0.59±0.93 | 0.32±1.02 | 0.41±1.03 |
Data presented as median (range) or mean±sd, unless otherwise stated. #: adjusted according to British 1990 growth charts [21].