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Table 1 Characteristics of the study population

From: Case–control study of HLA-G promoter methylation status, HPV infection and cervical neoplasia in Curitiba, Brazil: a pilot analysis

  Cases Controls  
  N % N %
Number 279   510 100 %
Controls (normal cytology) -   510  
CIN2 150 53.7 -  
CIN3 129 46.3 -  
Mean age 32 years   32 years  
Range 15-47   15-47  
Education level     
Elementary school 164 58.8 262 51.4
Middle school 93 33.3 159 31.2
High school 8 2.9 18 3.5
Missing 14 5.0 71 13.9
Ethnic group     
Euro-Descendent 90 32.3 239 46.9
Afro-Descendent 7 2.5 24 4.7
Brazilian Mixed* 162 58.1 180 35.3
Asian 1 0.4 1 0.2
Missing 19 6.8 66 12.9
Age at first sexual intercourse   16 years   17 years
Lifetime number of sexual partners     
1 42 15.0 156 30.6
2-10 208 74.6 275 53.9
>10 27 9.7 79 15.5
Missing 2 0.7 0 0
Number of full-term pregnancies 2   2  
Range 0-18   0-27  
Smoking status     
Never smoker 130 46.6 277 54.3
Former smoker 51 18.3 148 29.0
Number of cigarettes/day (mean) 7   8  
Current smoker 96 34.4 81 15.9
Number of cigarettes/day (mean) 7   8  
Missing 2 0.7 4 0.8
  1. *Brazilian Mixed: Mixed ethnicity with Euro-Descendent (mostly), Afro-Descendent, Amerindian and East Asian.