| Normal | Overweight | Obese | p for trend* | |
| IOTF cut-offs | ||||
| Boys | 657.9 (544.6–790.7) | 592.1 (487.4–739.7) | 540.2 (442.9–636.5) | <0.001 |
| n | 2108 | 412 | 114 | |
| Girls | 535.6 (448.5–643.7) | 508.5 (433.1–602.9) | 510.6 (440.2–599.7) | 0.001 |
| n | 2227 | 529 | 139 | |
| All | 590.6 (484.4–721.1) | 542.7 (454.4–673.1) | 520.0 (442.6–625.4) | <0.001 |
| n | 4335 | 941 | 253 | |
| British 1990 centiles | ||||
| Boys | 661.3 (548.1–796.6) | 615.5 (502.0–730.4) | 582.1 (475.3–723.1) | <0.001 |
| n | 1869 | 337 | 428 | |
| Girls | 538.3 (451.1–644.8) | 513.0 (426.9–611.3) | 506.6 (435.0–597.5) | <0.001 |
| n | 2098 | 378 | 419 | |
| All | 591.9 (486.1–723.0) | 554.1 (449.4–682.1) | 537.6 (455.4–659.3) | <0.001 |
| n | 3967 | 715 | 847 |
Values are median (IQR) for counts/min.
*From regression of log counts/min on obesity (entered as a linear term).