Figure 2

Prevalence of headache, stomach-ache and backache by gender and age-group. (Excluding adolescents who did not state: gender*headache n = 5620, 1.4%; gender*stomach-ache n = 6412, 1.6% and gender*backache n = 7142, 1.8%; age-group*headache n = 7590, 1.9%; age-group*stomach-ache n = 9096, 2.3%; age-group*backache n = 8378, 2.1%).