Fig. 3From: Psychiatric disorders and headache familial recurrence: a study on 200 children and their parentsPsychiatric comorbidity in child × frequency. Percentage count for observed frequencies in psychiatric comorbidity in child × frequency (1–3/month = 1; 1/week = 2; >4/month = 3) interaction. Partial χ2 = 5.52; df = 2; P = 0.06. Percentages are calculated separately for psychiatric comorbidity groupsBack to article page