Table 1 Characteristics of the study population
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 |