Table 1 Characteristics of subjects with obesity and normal weight in 2019 and 2020

Number of subjects:

Gender female: n (%)

2019

2020

2019

2020

Age: years

11.2 ± 2.1

12.2 ± 2.1

10.8 ± 3.3

11.8 ± 3.3

Age range: years

6.3–15.5

7.2–16.5

6.0–15.7

7.0–16.7

Weight: kg

63.6 ± 15.8

71.0 ± 15.4

36.8 ± 12.6

40.2 ± 12.8

Height: cm

151.8 ± 11.6

157.4 ± 11.1

143.9 ± 18.8

148.1 ± 17.4

BMI: kg.cm^− 2

27.1 ± 3.7

28.3 ± 3.5 ^δδδ

17.2 ± 1.8

17.8 ± 2.1^δδ

BMI z-score

2.72 ± 0.8

2.67 ± 0.8

− 0.11 ± 0.5

− 0.06 ± 0.5

Time in-between both visits: months

4.5 ± 1.5

4.3 ± 1.3

3.4 ± 1.1 ^††

3.8 ± 0.9

Weight: kg

66.5 ± 15.9

75.2 ± 16.0

38.5 ± 13.6

42.4 ± 13.2

Height: cm

154.4 ± 11.4

159.5 ± 11.1

144.8 ± 19.0

149.7 ± 17.1

BMI: kg.cm^− 2

27.5 ± 3.7

29.2 ± 4.0 ^δδδ

17.7 ± 2.1

18.3 ± 2.1 ^δ

BMI z-score

2.6 ± 0.7

2.72 ± 0.8

0.56 ± 0.5

0.11 ± 0.5

Weight gain between both visits

2.9 ± 2.5 ^***

4.2 ± 4.7 ^***

1.7 ± 0.4 ^{***, †}

1.6 ± 0.4 ^{***, ¥¥}

Weight gain: range

−2.3 – 8.4

−10.1 – 18.4

0.2–6.5

0.2–7.0

Difference of BMI between both visits

0.33 ± 1.0 ^*

0.96 ± 1.5 ^***,δ

0.87 ± 0.2 ^*

0.51 ± 0.1 ^***

Difference of BMI between both visits: range

−1.9 – 3.1

−3.8 – 6.1

−0.3 – 2.8

− 0.01 – 2.1