Table 2 Relationship between misreporting of height/weight and background factors in Japanese primary school children (n = 1019)

Age (year)

10

225

(46.3)

-0.17,

2.1

0.49

0.07,

1.5

0.21

233

(43.7)

0.07,

1.2

0.80

-0.02,

1.7

0.10

11

237

(48.8)

-0.15,

2.4

-0.28,

1.7

267

(50.1)

0.12,

1.8

-0.20,

2.1

12

24

(4.9)

0.39,

1.7

0.32,

2.1

33

(6.2)

0.06,

1.3

-0.58,

2.2

School

A

46

(9.5)

-0.28,

2.5

0.14

-0.07,

1.4

0.08

47

(8.8)

-0.08,

0.8

0.22

-0.10

1.7

0.08

B

84

(17.3)

0.32,

1.2

0.33,

1.6

87

(16.3)

0.13,

1.5

-0.04

1.5

C

77

(15.8)

-0.25,

1.6

-0.21,

1.9

103

(19.3)

0.16,

1.5

0.18

2.2

D

101

(20.8)

-0.59,

3.6

0.03,

2.0

103

(19.3)

-0.12,

1.7

0.04

2.0

E

37

(7.6)

0.22,

1.5

-0.05,

1.0

24

(4.5)

-0.32,

1.3

-0.17

1.1

F

85

(17.5)

0.06,

1.9

-0.42,

1.2

97

(18.2)

0.15,

0.7

-0.64

1.9

G

56

(11.5)

-0.22,

1.6

-0.32,

1.6

72

(13.5)

0.43,

2.4

-0.32

2.1

Measured height (cm)

Small

161

(33.1)

-0.15,

2.5

0.84

0.14,

1.3

0.04

176

(33.0)

0.24,

2.1

0.05

0.12,

1.8

 < 0.01

Medium

160

(32.9)

-0.16,

2.4

-0.19,

1.7

179

(33.6)

0.13,

1.1

-0.10,

1.6

Large

165

(34.0)

-0.10,

1.9

-0.22,

1.8

178

(33.4)

-0.09,

1.2

-0.43,

2.2

Measured weight (kg)

Small

161

(33.1)

-0.32,

2.6

0.27

0.35,

1.5

 < 0.01

177

(33.2)

0.38,

2.0

0.02

0.25,

1.5

 < 0.01

Medium

160

(32.9)

-0.04,

2.3

0.08,

1.3

177

(33.2)

-0.09,

1.2

0.06,

1.4

Large

165

(34.0)

1.8

-0.68,

1.9

179

(33.6)

-0.01,

1.2

-0.72,

2.5

Self-awareness of weight

Light

77

(15.8)

-0.37,

3.0

0.08

0.48,

1.8

 < 0.01

69

(13.0)

0.69,

2.6

 < 0.01

0.36,

1.4

 < 0.01

Adequate

304

(62.6)

-0.18,

2.0

-0.09,

1.4

353

(66.2)

0.02,

1.3

-0.15,

1.9

Heavy

105

(21.6)

0.19,

2.2

-0.51,

2.0

111

(20.8)

-0.05,

1.4

-0.43,

2.3

Intention to lose weight

Yes

113

(23.3)

0.08,

2.6

0.26

-0.53,

1.7

 < 0.01

141

(26.5)

0.06,

1.2

0.74

-0.36,

2.0

0.12

No

373

(76.8)

-0.20,

2.1

0.04,

1.6

392

(73.6)

0.11,

1.6

-0.06,

1.9

Nutrition knowledge score

Low

156

(32.1)

-0.14,

2.5

0.93

-0.15,

1.8

0.58

165

(31.0)

-0.04,

1.7

0.08

-0.05,

1.9

0.24

Medium

158

(32.5)

-0.15,

2.3

-0.07,

1.7

182

(34.2)

0.07,

1.3

-0.06,

1.8

High

172

(35.4)

-0.12,

2.0

-0.05,

1.4

186

(34.9)

0.24,

1.6

-0.29,

2.0

Frequency of exercise for > 60 min

0

50

(10.4)

-0.43,

2.2

0.78

0.49,

1.7

0.17

65

(12.4)

0.04,

0.9

0.56

-0.04,

1.9

0.98

(day/1 week)

1 ~ 2

175

(36.3)

-0.01,

2.3

-0.10,

1.5

237

(45.1)

0.10,

1.9

-0.15,

1.7

3 ~ 4

136

(28.2)

-0.23,

2.4

-0.41,

1.9

125

(23.8)

0.03,

1.2

-0.34,

2.2

5 ~ 7

121

(25.1)

-0.09,

2.1

0.00,

1.4

99

(18.8)

0.22,

1.2

0.02,

2.1

Questionnaire respondent

Child only

251

(51.7)

-0.19,

2.3

0.39

-0.25,

1.7

0.07

269

(50.5)

0.11,

1.6

0.29

-0.31,

2.2

0.03

Child + Guardian

169

(34.8)

-0.19,

2.1

0.09,

1.5

210

(39.4)

0.00,

1.3

-0.08,

1.5

Guardian only

66

(13.6)

0.22,

2.5

0.08,

1.6

54

(10.1)

0.36,

1.9

0.44,

1.8