p_g < 0.001

Age groups

Under 6 years

(n = 341)

6 - 9 years

(n = 385)

10 - 12 years

(n = 351)

13 years and more

(n = 233)

p value

Head and neck

70.4%

48.6%

20.8%

13.7%

p_t < 0.001

Upper limbs

17.6%

27.8%

45.9%

39.1%

p < 0.001

Chest and pelvis

2.1%

3.1%

3.7%

5.6%

p = 0.725

Lower limbs

7.0%

17.7%

25.9%

34.8%

p_t < 0.001

General affection

2.9%

2.9%

3.7%

6.9%

p = 0.550