Table 1 Baseline characteristics of studied children in Guangzhou^a

N (%)

7203

3821(53.0)

3382(47.0)

0.31

Age (year)

6.6 ± 0.6

6.6 ± 0.6

6.6 ± 0.6

0.13

Weight (kg)

25.2 ± 4.8

27.2 ± 5.1

23.7 ± 4.2

< 0.001

Height (m)

1.25 ± 0.06

1.27 ± 0.059

1.22 ± 0.059

< 0.001

BMI (kg/m²)

15.4 ± 2.1

15.8 ± 2.2

14.9 ± 1.9

< 0.001

Thinness (%)

18.6

18.5

18.8

< 0.001

Normal weight (%)

67.4

64.5

70.1

< 0.001

Overweight (%)

7.7

8.6

6.1

< 0.001

Obesity (%)

6.3

8.4

5.0

< 0.001

SBP(mm/Hg)

96.9 ± 6.1

98.5 ± 6.5

94.1 ± 6.3

< 0.001

DBP(mm/Hg)

56.1 ± 7.3

56.6 ± 7.3

54.5 ± 7.0

< 0.001