Table 1.

Age and sex distribution of the study population and the response rate of the questionnaires.

Number of participating families				Response rate, n
Age	Total	Female	Male	Children	Female	Male	Parents
8–11	42	25	17	41	25	16	42
12–15	104	67	37	102	65	37	100
16–18	14	13	1	13	12	1	10
Total	160	105	55	156a	102	54	152b

^aOne questionnaire was broken and three parents came to the clinic without their children.

^bEight adolescents visited the clinic without their parents.