Table 1

Description of Iowa Bone Development Study participants by wave and gender

WaveAge, yearsHeight, cmWeight, kgMVPA, min/day
N*MeanMeanMeanMean
Girls (n=263)
 12035.3±0.4111.0±5.420.0±4.047.7±19.8
 22488.7±0.6132.9±6.932.0±8.746.3±20.3
 324711.2±0.3149.1±7.544.5±12.439.7±19.2
 423813.3±0.4160.7±6.656.3±14.632.9±19.3
 520415.3±0.3164.5±6.562.1±14.725.7±16.7
 619517.5±0.4165.6±6.766.8±16.823.7±15.5
Boys (n=267))
 11845.2±0.4112.2±5.720.6±3.659.5±23.7
 22458.8±0.7135.0±7.333.8±9.665.4±28.7
 325011.2±0.3149.1±7.545.4±13.064.1±28.6
 424313.3±0.4163.1±9.358.5±15.952.1±25.3
 521215.4±0.3175.3±7.870.8±16.138.0±20.3
 619217.5±0.4178.7±7.578.7±17.235.8±21.4
  • *Number of observations per wave for MVPA, a few participants did not have scanning visits (body size measurements) for corresponding waves.

  • Age at PHV: mean=11.8±0.6, range=10.2–14.5.

  • Age at PHV: mean=13.6±0.8, range=10.5–16.1.

  • MVPA, moderate-and-vigorous intensity physical activity; PHV, peak height velocity.