Table 2.

The associations between family PIR and HPV infection status.

Exposure	Model I OR (95% CI) P	Model II OR (95% CI) P	Model III OR (95% CI) P
Ratio of family income to poverty	0.83 (0.81,0.86) <0.0001	0.91 (0.89, 0.94) <0.0001	0.91 (0.89, 0.94) <0.0001
PIR classification
Low income(PIR<1)	Reference	Reference	Reference
Middle income(PIR 1-4)	0.70 (0.63, 0.77) <0.0001	0.83 (0.74, 0.92) 0.0005	0.82 (0.74, 0.92) 0.0004
High income(PIR≥4)	0.46 (0.41, 0.52) <0.0001	0.70 (0.61, 0.79) <0.0001	0.69 (0.61, 0.79) <0.0001
P for trend	<0.0001	<0.0001	<0.0001

Model I: None covariates were adjusted;

Model II: Age, race, and marital status were adjusted;

Model III: Age, race, marital status, drink status, smoke status, sexual intercourse, diabetes, and BMI were adjusted.

PIR, the ratio of family income to poverty; BMI, body mass index; HPV, human papillomavirus.