Table 3 Comparison of % helmet use from survey and sentinel injury surveillance in 2010 by province

Ayutthaya

41.87

12.85

29.02

21.65

13.55

8.10

26.50

11.26

15.24

39.4

13.57

25.81

Saraburi

57.90

17.49

40.41

38.24

11.03

27.21

33.36

10.08

23.28

60.4

17.42

42.98

Chonburi

53.09

1.89

51.20

40.02

1.95

38.07

32.78

0.87

31.91

56.5

2.21

54.33

Rayong

45.33

16.81

28.52

29.85

14.73

15.12

26.02

8.72

17.30

46.4

18.25

28.12

Chanthaburi

35.58

14.61

20.97

27.61

19.62

7.99

21.20

5.32

15.88

39.3

18.56

20.70

Prachinburi

29.23

15.73

13.50

20.98

17.31

3.67

18.32

11.82

6.50

32.1

17.37

14.71

Nakhonratchasima

52.05

25.93

26.12

42.93

31.65

11.28

38.28

17.29

20.99

58.7

31.27

27.44

Surin

59.22

9.99

49.23

39.61

18.99

20.62

43.37

7.88

35.49

70.0

14.1

55.90

Ubornratchathani

49.90

13.69

36.21

32.99

23

9.99

34.27

11.87

22.40

49.0

17

31.98

Khonkaen

54.18

11.93

42.25

11.88

16.04

−4.16

14.28

7.02

7.26

50.3

15.04

35.31

Udornthani

46.13

4.8

41.33

10.71

8.8

1.91

16.19

4.55

11.64

42.2

6.2

35.97

Lampang

44.85

8.45

36.40

47.94

17.35

30.59

29.28

7.08

22.20

55.1

11.7

43.37

Uttaradit

39.73

10.85

28.88

42.17

19.38

22.79

30.60

10.1

20.50

48.7

14.16

34.50

Chiangrai

40.09

4.51

35.58

30.28

9.09

21.19

27.90

2.39

25.51

41.3

6.62

34.69

Nakhonsawan

55.37

15.61

39.76

41.05

17.45

23.60

41.56

10.63

30.93

53.0

17.8

35.20

Phitsanulok

51.41

11.68

39.73

49.63

21.01

28.62

45.47

9.55

35.92

56.5

15.32

41.14

Ratchaburi

31.98

2.53

29.45

22.91

3.42

19.49

21.45

2.66

18.79

35.8

2.85

32.93

Suphanburi

34.74

1.48

33.26

24.57

2.9

21.67

23.36

0.7

22.66

35.3

2.18

33.10

Nakhonpathom

41.28

13.32

27.96

22.05

12.64

9.41

19.69

3.53

16.16

43.1

16.23

26.85

Nakhonsithammarat

42.16

12.29

29.87

29.09

14.82

14.27

16.50

6.99

9.51

44.7

15.34

29.40

Suratthani

37.28

9.66

27.62

31.31

12

19.31

24.60

6.98

17.62

41.9

11.75

30.17

Songkhla

45.51

20.14

25.37

33.75

21.68

12.07

30.77

9.6

21.17

45.0

24.75

20.25

Trang

50.61

8.83

41.78

33.21

10.9

22.31

26.15

4.89

21.26

51.7

11.29

40.40

Yala

25.60

3.25

22.35

25.95

3.37

22.58

13.61

1.31

12.30

30.9

4.14

26.79

Nonthaburi

69.60

5.29

64.31

40.81

1.16

39.65

44.41

4

40.41

71.3

4.64

66.67

Chachengsoa

36.93

6.54

30.39

21.13

5.47

15.66

18.86

2.88

15.98

36.5

7.3

29.15

overall

34.29

17.81

20.72

34.53

95% limiits of agreement*

13.48, 55.09

−2.76; 38.36

3.69, 37.76

12.13, 56.95

rho_c**

0.218

0.332

0.401

0.215

p-value of rho_c

0.285

0.097

0.042

0.292