Table 3 Headache diagnoses by school grade among pupils (both genders) reporting headache during the preceding year

44.2%^a

40.5%^a

30.8%^b

29.2%^b

27.4%^a

28.5%^a

34.6%^a

34.2%^a

16.4%^a

6.4%^b

6.3%^b

8.6%^b

11.0%^a

22.1%^b

28.3%^c

25.6%^b,c

23.3%^a

26.7%^a,b

28.3%^a,b

32.6%^b

16.7%^a,b

18.2%^b

18.9%^a,b

24.0%^a

6.6%^a

8.5%^a

9.4%^a

8.6%^a

3.7%^a

2.8%^a

5.5%^a

3.4%^a

0.9%^a

0.6%^a

1.7%^a

1.5%^a

2.8%^a

2.2%^a

3.8%^a

1.9%^a

1.3%^a

1.3%^a

0.9%^a

0.7%^a