Table 1.

Characteristics of the study population.

Characteristics	N	Mean ($(\overline{x}\pm s)$) or prevalence (%)
Age	393	50.8 ± 9.2
Age of menarche	393	15.2 ± 1.7
Age of menopause	393	46.3 ± 6.8
Age at first pregnancy	393	22.6 ± 3.0
Age at first birth	393	23.4 ± 3.1
Level of education
Uneducated	37	9.4
Primary education	137	34.9
Junior middle school education	167	42.5
High school education	44	11.2
≥University education	8	2.0
Smoking
Yes	0	0.0
No	393	100
Drinking
Yes	3	0.8
No	390	99.2
Times of pregnancy
≤3	286	72.8
>3	107	27.2
Times of reproduction
≤3	362	92.1
>3	31	7.9
HPV infection
Positive	142	36.1
Negative	251	63.9