Table 4 Results of logistic regression

OR(95%CI)

Gender

 Male

Reference

 Female

0.77

(0.67–0.89)^***

0.47

(0.39–0.57)^***

0.91

(0.83-1.00)^*

1.33

(1.26–1.41)^***

1.53

(1.45–1.60)^***

Age

9

Reference

10

0.64

(0.48–0.85)^**

0.67

(0.50–0.90)^**

0.72

(0.60–0.86)^***

0.75

(0.66–0.86)^***

0.93

(0.83–1.05)

11

0.53

(0.39–0.71)^***

0.33

(0.23–0.48)^***

0.63

(0.52–0.76)^***

0.93

(0.82–1.06)

1.10

(0.98–1.23)

12

0.65

(0.50–0.87)^**

0.42

(0.30–0.59)^***

0.62

(0.51–0.74)^***

1.09

(0.96–1.23)

1.30

(1.16–1.46)^***

13

0.61

(0.46–0.81)^**

0.36

(0.25–0.51)^***

0.59

(0.49–0.72)^***

1.04

(0.91–1.18)

1.44

(1.28–1.61)^***

14

0.59

(0.45–0.79)^***

0.30

(0.21–0.44)^***

0.63

(0.53–0.76)^***

1.39

(1.23–1.57)^***

1.87

(1.68–2.09)^***

15

0.47

(0.34–0.64)^***

0.16

(0.10–0.26)^***

0.59

(0.49–0.72)^***

1.42

(1.25–1.61)^***

1.96

(1.76–2.19)^***

16

0.69

(0.53–0.91)^**

0.42

(0.30–0.59)^***

0.55

(0.45–0.66)^***

1.33

(1.18–1.51)^***

1.76

(1.58–1.97)^***

17

0.65

(0.49–0.87)^**

0.50

(0.36–0.69)^***

0.57

(0.47–0.69)^***

1.25

(1.10–1.42)^**

1.78

(1.59–1.99)^***

Board at school

 Yes

Reference

 No

0.97

(0.83–1.12)

1.03(0.86–1.24)

1.06

(0.97–1.17)

1.07

(1.01–1.13)^**

1.02

(0.97–1.07)

BMI

Normal

Reference

Overweight

1.13

(0.92–1.40)

1.01

(0.77–1.32)

1.17

(1.03–1.34)^**

1.16

(1.06–1.26)^**

1.13

(1.06–1.22)^**

Obese

1.36

(0.98–1.89)

1.23

(0.90–1.89)

1.19

(0.95–1.50)

1.27

(1.11–1.46)^**

1.14

(1.01–1.29)^*

Recent acute symptoms

 Yes

Reference

 No

1.13

(0.97–1.31)

1.03(0.86–1.25)

1.17

(1.06–1.28)^**

1.19

(1.12–1.26)^***

1.19

(1.13–1.25)^***