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Table 2 Multivariate analyses of factors associated with multiple HPV infections compared with single infections

From: Behavioral factors associated with multiple-type HPV genital infections: data from a cross-sectional study in young women in Brazil

  Model 1 Model 2 Model 3
Prevalence ratio (95% confidence interval)
Age    
 16–21 years 1 1 1
 22–25 years 0.82 (0.75–0.91) 0.85 (0.77–0.93) 0.84 (0.75–0.93)
Race/color    
 White 1 1 1
 Black 1.10 (0.95–1.27) 1.09 (0.94–1.25) 1.11 (0.95–1.29)
 Brown 1.03 (0.92–1.17) 1.05 (0.93–1.18) 1.05 (0.93–1.20)
 Other 0.94 (0.67–1.33) 0.93 (0.65–1.32) 0.89 (0.60–1.34)
Relationship status    
 Single or without partner   1.34 (1.19–1.52) 1.29 (1.12–1.48)
 Dating or casual   1.26 (1.13–1.42) 1.20 (1.06–1.36)
 Married or living together   1 1
 Divorced/widowed   1.17 (0.78–1.76) 1.10 (0.73–1.67)
Smoking status    
 Nonsmoker   1 1
 Smoker   1.05 (0.91–1.20) 1.04 (0.89–1.21)
 Ex-smoker   1.01 (0.90–1.13) 1.02 (0.91–1.15)
No. of sexual partners in the last year    
 < 2    1
 ≥ 2    1.13 (1.02–1.25)
Sexually transmitted infection    1.00 (0.87–1.14)
Age at first sexual intercourse    
 < 14 years    1.02 (0.89–1.17)
 ≥ 14 years    1
Type of sex    
 Exclusively vaginal    1
 Other sex types excluding vaginal    0.86 (0.46–1.62)
 Vaginal and other sex types    1.06 (0.95–1.19)
Condom use in the last intercourse    1.00 (0.90–1.10)
  1. Poisson regression with robust variance
  2. Model 1: age and race/color
  3. Model 2: Model 1 + relationship status and smoking status
  4. Model 3: Model 2 + number of sexual partners in the last year, presence of sexually transmitted infection, age at first sexual intercourse, type of sex practices and condom use in the last intercourse