Table 3: Average changes of BMI-SDS by age and sex.

Average changes during…10-11 years
Girls ( )Boys ( )
Mean difference of BMI-SDS:
mean (SD)
Test statistics1Successful weight reduction2 in 10-11-year-old girls (in %)Mean difference of BMI-SDS:
mean (SD)
Test statistics1Successful weight reduction2 in 10-11-year-old boys (in %)

1-year program
(Baseline to end of program)
−0.27 (0.41)Mdn = −0.26
= −5.06,  
54.4%−0.28 (0.32)Mdn = −0.26
= −5.59,   
53.8%
Baseline to 36-month follow-up (3YFU)−0.08 (0.49)Mdn = 0
= −1.30, n.s.
27.8%−0.11 (0.33)Mdn = 0
= −2.33,   
< 0.050
23.1%
Baseline to 60-month follow-up (5YFU)−0.06 (0.52)Mdn = 0
= −0.68, n.s.
17.7%−0.03 (0.34)Mdn = 0
= −0.40, n.s.
12.3%

Average changes during…12-13 years
Girls ( )Boys ( )
Mean difference of BMI-SDS:
mean (SD)
Test statistics1Successful weight reduction2 in 12-13-year-old girls (in %)Mean difference of BMI-SDS:
mean (SD)
Test statistics1Successful weight reduction2 in 12-13-year-old boys (in %)

1-year program
(Baseline to end of program)
−0.41 (0.44)Mdn = −0.33
= −9.19,   
< 0.001
57.2%−0.35 (0.39)Mdn = −0.29  
= −8.41,   
< 0.001
59.2%
Baseline to 36-month follow-up (3YFU)−0.31 (0.51)Mdn = −0.04  
= −6.98,   
< 0.001
41.0%−−0.16 (0.48)Mdn = 0  
= −3.16,   
< 0.010
31.9%
Baseline to 60-month follow-up (5YFU)−0.25 (0.59)Mdn = 0  
= −5.13,
< 0.001
25.5%−0.09 (0.51)Mdn = 0  
= −1.58, n.s.
17.7%

Average changes during…14-15 years
Girls ( )Boys ( )
Mean difference of BMI-SDS:
mean (SD)
Test statistics1Successful weight reduction2 in 14-15-year-old girls (in %)Mean difference of BMI-SDS:
mean (SD)
Test statistics1Successful weight reduction2 in 14-15-year-old boys (in %)

1-year program
(Baseline to end of program)
−0.36 (0.42)Mdn = −0.27
= −7.01,   
< 0.001
55.2%−0.38 (0.42)Mdn = −0.29
= −6.00,   
< 0.001
60.6%
Baseline to 36-month follow-up (3YFU)−0.28 (0.53)Mdn = 0
= −4.70,   
< 0.001
39.0%−0.13 (0.47)Mdn = 0
= −2.06,   
< 0.050
30.3%
Baseline to 60-month follow-up (5YFU)−0.22 (0.41)Mdn = 0
= −4.70,   
< 0.001
27.5%−0.17 (0.52)Mdn = 0
= −52.72,   
< 0.010
19.7%

Test statistics calculated by Wilcoxon-test.
2“Successful weight reduction” means a BMI-SDS reduction > 0.2 BMI-SDS.
SD: standard deviation.
Mdn: median.
3YFU: 3-year follow-up (36 month/3 years after baseline).
5YFU: 5-year follow-up (60 month/5 years after baseline).