Table 1

Descriptive statistics of the sample (n=557)

Change (Time 2—Time 1)
Time 1Time 2Mean (SD)Range
Demographic
 Male, n (%)307 (55%)
 Age, mean (SD)9.6 (0.9)11.6 (0.9)2.1 (0.1)
 Prepubertal, n (%)*441 (79%)181 (32%)
Anthropometry, mean† (SD)
 BMIkg/m219.4 (4.2)21.1 (4.9)1.7 (1.7)−6.0 to 11.5
 BMIpercentage14.0 (19.4)15.2 (21.1)1.2 (7.4)−35.6 to 28.1
 BMIcentile68.5 (28.2)68.5 (28.7)−0.05 (12.1)−39.8 to 49.4
 BMIz-score0.70 (1.0)0.69 (1.1)−0.01 (0.4)−1.75 to 1.70
DEXA, mean (SD)
 FMkg10.7 (7.4)15.0 (9.7)4.3 (3.8)−8.1 to 25.1
 FMpercentage26.1 (10.8)28.4 (10.9)2.3 (4.7)−15.3 to 16.5
 FMz-score0.0 (1.0)0.0 (1.0)0.0 (0.4)−1.5 to 1.7
 FMI5.4 (3.4)6.4 (3.8)1.0 (1.4)−5.0 to 8.0
  • *Four participants missing pubertal status at visit 2.

  • †Median anthropometry at Time 1: BMI: 18.2, BMIpercentage: 10.0, BMIcentile: 76.0, BMIz-score: 0.70; Median anthropometry at Time 2: BMI: 19.9, BMIpercentage: 12.4, BMIcentile: 78.6, BMIz-score: 0.80, FM: total fat mass, FMI: fat mass index.

  • BMI, body mass index; DEXA, dual-energy X-ray absorptiometry.