Table 1 General characteristics of participants

 3–6 years

191

(21.8)

207

(23.2)

0.838

 6–9 years

216

(24.6)

223

(24.9)

 9–12 years

232

(26.4)

222

(24.8)

 12–15 years

239

(27.2)

242

(27.1)

 3–6 years

107.1

(7.2)

104.8

(7.2)

0.001

 6–9 years

125.2

(7.7)

124.2

(7.8)

0.179

 9–12 years

144.5

(9.7)

143.7

(8.2)

0.321

 12–15 years

162.5

(9.0)

155.3

(5.1)

< 0.001

 3–6 years

18.0

(3.3)

17.1

(3.1)

0.004

 6–9 years

26.6

(6.3)

25.2

(5.4)

0.016

 9–12 years

40.0

(10.5)

37.7

(7.6)

0.008

 12–15 years

53.5

(12.7)

47.7

(7.7)

< 0.001

 3–6 years

15.6

(1.6)

15.5

(1.6)

0.453

 6–9 years

16.8

(2.8)

16.2

(2.2)

0.015

 9–12 years

18.9

(3.4)

18.1

(2.7)

0.008

 12–15 years

20.1

(3.8)

19.7

(2.8)

0.261

 Overweight

175

(19.9)

115

(12.9)

< 0.001

 Non-overweight

703

(80.1)

779

(87.1)

 With food allergy

65

(7.4)

56

(6.3)

0.342

 Without food allergy

813

(92.6)

838

(93.7)

 With asthma

200

(22.8)

125

(14.0)

< 0.001

 Without asthma

678

(77.2)

769

(86.0)