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 statistics1 Successful weight reduction2 in 10-11-year-old girls (in %) Mean difference of BMI-SDS:mean (SD) Test statistics1 Successful 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 statistics1 Successful weight reduction2 in 12-13-year-old girls (in %) Mean difference of BMI-SDS:mean (SD) Test statistics1 Successful 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 statistics1 Successful weight reduction2 in 14-15-year-old girls (in %) Mean difference of BMI-SDS: mean (SD) Test statistics1 Successful 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).