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Table 3 Bivariate and multivariate analyses on the demographic and sex behavioral correlates of STI infection among non-sex worker Japanese women.

From: Demographic and behavioral characteristics of non-sex worker females attending sexually transmitted disease clinics in Japan: a nationwide case-control study

Characteristic Crude odds ratio 95%CI* Adjusted odds ratio† 95%CI
Socio-demographic factors     
   Age (years) 0.83 0.80-0.86 0.94 0.89-0.99
   Occupation     
Unemployed, full time student or housewife 0.69 0.47-1.01 0.61 0.30-1.25
Others 1.00   1.00  
   Education     
High school education or less 0.86 0.60-1.21 0.76 0.39-1.48
University education or above 1.00   1.00  
   Marital status     
Unmarried 21.74 13.34-35.40 4.11 1.73-9.77
Married 1.00   1.00  
Behavioral factors     
   First sexual experience (years)     
18 7.26 4.87-10.82 1.77 0.89-3.54
19 1.00   1.00  
   Number of sexual partners (previous year)     
2 12.72 8.29-19.54 3.09 1.42-6.71
1 1.00   1.00  
   Sex with regular partners (previous year)     
Had unprotected vaginal sex     
Yes 3.02 1.78-5.11 3.59 1.49-8.64
No 1.00   1.00  
Had unprotected oral sex     
Yes 4.85 2.91-8.10 1.34 0.57-3.18
No 1.00   1.00  
Had unprotected anal sex     
Yes 1.56 0.76-3.18 0.83 0.23-2.95
No 1.00   1.00  
   Sex with casual partners (previous year)     
Had unprotected vaginal and/or oral sex     
Yes 23.16 13.51-39.68 2.08 0.75-5.71
No 1.00   1.00  
  1. * CI, confidence interval
  2. †Odds ratio was adjusted by multiple logistic regression analysis for districts (Hokkaido/Tohoku, Kanto-Koshinetsu, Chubu/Kinki, Chugoku/Kyushu)