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Table 1 Demographics of 12,656 biopsied participants

From: Distribution of cervical intraepithelial neoplasia on the cervix in Chinese women: pooled analysis of 19 population based screening studies

  Mean ± SD Median (Range)
Age in years 41.5 ± 7.2 41 (19-65)
Age at menarche in years 15.7 ± 1.9 16 (10-26)
Sexual history
Age at sexual debut in years 20.9 ± 2.3 21 (13-37)
Number of pregnancies 3.0 ± 1.3 (0-16)
Number of live births 2.3 ± 1.0 (0-14)
Number of sexual partners 1.5 ± 1.2 (0-40)
  Number (n) Percentage (%)
Marital status
Single 34 0.30 %
Married 12081 96.10 %
Widowed 235 1.90 %
Divorced 77 0.60 %
Education level
<Primary school 1262 10.00 %
Primary school 4055 32.20 %
Middle school 6088 48.40 %
High school or above 1027 8.20 %
Current contraceptiveuse
Yes 11510 91.50 %
Contraceptive method   
Oral contraceptive pill 269 2.30 %
Condom 473 4.10 %
IUD 3476 30.20 %
Sterilization 8913 77.40 %
Smoking history
Never smoked 12061 95.90 %
Quit smoking 40 0.30 %
Current smoker 271 2.20 %
  1. SD standard deviation; IUD intrauterine device