Table 2—

Average annual rates of change in BMI: predicted and observed*

SexBaseline–Year 1Years 1, 2, and 3Years 3, 4, 5, and 6Years 6, 7, 8, and 9P value
P value for difference between groups0.00010.00020.00580.3870
P value for difference between groups<0.0001<0.00010.00820.3573
  • *

    * The upper figure of each pair is the average annual change in BMI predicted by the growth-curve model during the interval in question. The lower figure is the observed average rate of change for the same period. P values for the treatment-group difference in observed rates of change are from the Wilcoxon’s rank-sum test (baseline–year 1) or the Wei-Lachin test of stochastic ordering, applied separately for all other periods.

  • P value for test of trends over time, based on observed rates, between treatment groups within sex.