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Table 1 Demographic profile of Japanese non-sex worker female STI clinic attendees compared with population-based female controls

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

  STI* clinic attendees (n = 145) Population-based controls (n = 956)  
Characteristic n % n % pvalue†
Age at survey      < 0.001§
   18-19 19 13.1 18 1.9  
   20-29 96 66.2 225 23.5  
   30-39 26 17.9 353 36.9  
   40-50 4 2.8 360 37.7  
   Missing 0 0 0 0  
   Mean(SD*) 25.0(5.9)   36.1(8.7)   
   Median 23   36   
Employment      < 0.001
   Self-employed 7 4.8 86 9.0  
   Management 0 0 6 0.6  
   Employee 88 60.7 467 48.8  
   Unemployed, full time student 40 27.6 57 6.0  
   Housewife 5 3.4 326 34.1  
   Missing 5 3.4 14 1.5  
Marital status      < 0.001
   Married 21 14.5 746 78.0  
   Not married 123 84.8 201 21.0  
   Missing 1 0.7 9 0.9  
Education level      0.43
   High school or below 66 45.5 471 49.3  
   College/university or above 79 54.5 482 50.4  
   Missing 0 0 3 0.3  
HIV/STI-related knowledge score     <0.001§
   Mean(SD) 11.9(3.0)   9.6(3.6)   
   Median 12   10   
  1. * STI, sexually transmitted infection; SD, standard deviation
  2. p values for chi-square test unless otherwise noted
  3. ¶Score for HIV/STI-related knowledge is the total number of 18 questions answered correctly.
  4. §P values for Student's t-test