Table 1.

Sociodemographic characteristics of respondents

Characteristics	Frequency (n=482)	Percentage
Age (years)
13	18	3.7
14	24	5.0
15	146	30.3
16	130	27.0
17	118	24.5
18	32	6.6
19	14	2.9
Age at menarche (years)
9	2	0.4
10	12	2.5
11	43	8.9
12	57	11.8
13	133	27.6
14	144	29.9
15	75	15.6
16	16	3.3
Social class of the parents
I	23	4.8
II	86	17.8
III	219	45.4
IV	124	25.7
V	30	6.2