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Table 2 Sexual behavior 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 first sexual intercourse (years)      <0.001
   <19 105 72.4 244 25.5  
   19 or older 38 26.2 641 67.1  
   Missing 2 1.4 71 7.4  
   Mean(SD*) 17.6(2.7)   20.5(3.3)   
   Median 17   20   
No. of partners (previous year)      <0.001
   1 56 38.6 871 91.1  
   2 or 3 33 22.8 65 6.8  
   4 or more 30 20.7 12 1.3  
   Missing 26 17.9 8 0.8  
Type of sex partner (previous year)      
   Regular partner      0.011
Yes 139 95.9 942 98.5  
No 6 4.1 10 1.0  
Missing 0 0 4 0.4  
   Casual Partner      <0.001
Yes 58 40.0 35 3.7  
No 86 59.3 908 95.0  
Missing 1 0.7 13 1.4  
Sex with regular partners (previous year)      
   Had unprotected vaginal sex      
Yes 119 82.1 622 65.1 <0.001
No 17 11.7 268 28.0  
Missing 9 6.2 66 6.9  
   Had unprotected oral sex      
Yes 122 84.1 524 54.8 <0.001
No 18 12.4 375 39.2  
Missing 5 3.4 57 6.0  
   Had unprotected anal sex      
Yes 10 6.9 42 4.4 0.31
No 130 89.7 851 89.0  
Missing 5 3.4 63 6.6  
Sex with casual partners (previous year)      
   Had unprotected vaginal sex      
Yes 44 30.3 20 2.1 <0.001
No 94 64.8 922 96.4  
Missing 7 4.8 14 1.5  
   Had unprotected oral sex      
Yes 40 27.6 17 1.8 <0.001
No 97 66.9 925 96.8  
Missing 8 5.5 14 1.5  
   Had unprotected anal sex      
Yes 0 0 1 0.1 1.00
No 138 95.2 941 98.4  
Missing 7 4.8 14 1.5  
  1. * STI, sexually transmitted disease; SD, standard deviation
  2. p values for chi-square test unless otherwise mentioned