Table 4.

Hip BMC and BMD Adjusted Least Squares Means by Quartiles of Vigorous Physical Activity and Percent Change (%) from Least Active Quartile (1) (n = 179 Boys and 189 Girls)

Least
Active
1
23Most
Active
4
BMC-hip (g)
 Boys6.966.93  −0.4%7.20  3.6%7.82*  12.5%
 Girls6.566.86  4.6%6.94  5.8%7.30*  11.3%
BMD-hip
(g/cm2)
 Boys0.5720.573  0.2%0.574  0.4%0.600  5.0%
 Girls0.5410.549  1.5%0.548  1.3%0.569*  5.2%
  • * Quartile significantly different than Quartile 1 (least active) (P < .05). Percent change from Quartile 1 (Least Active).

    Note: Means adjusted for age, weight, and height.

    Vigorous activity = accelerometry-determined number of minutes/day at an estimated ≥6 METs, SE of the mean = 0.17 for BMC-hip (boys), 0.14 BMC-hip (girls), and 0.008 for BMD-hip (boys and girls).