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Table 2 Timing of sex initiation and its association with subesequent sexual behaviors and risks.

From: Early initiation of sexual activity: a risk factor for sexually transmitted diseases, HIV infection, and unwanted pregnancy among university students in China

Variables Total (n = 1908)a BHS (n = 115)a HS (n = 705)a Univ (n = 1088)a P valueb
First sex      
   Partner type      
Regular 85.4 60.9 83.4 89.2  
Non-regualr 13.9 35.7 16.2 10.2 < 0.001
   Condom use      
Used 29.8 15.7 27.2 32.9 < 0.001
Not used/unsure 69.8 84.3 72.2 66.6  
Most recent sex      
   Partner type      
Regular 78.6 62.6 78.0 80.7  
Non-regualr 10.5 26.1 11.2 8.4 < 0.001
   Condom use      
Used 44.2 32.2 42.3 46.7 0.002
Not use 46.9 59.1 48.9 44.3  
   OC use by partner      
Used 23.8 21.7 23.3 24.4 0.429
Not use 66.1 70.4 66.4 65.4  
Sex during last year c      
   Partner type      
Only regular 83.0 55.0 81.8 86.5  
Ever non-regular 14.7 40.0 17.4 10.6 < 0.001
   Condom use      
Always/often 40.3 18.8 35.6 45.2 < 0.001
Never/rarely/sometime 55.1 76.3 60.4 49.9  
   OC use by partner      
Always/often 22.3 13.8 20.2 24.4 0.003
Never/rarely/sometime 74.8 83.8 77.8 72.1  
   Partner number      
1 74.1 33.8 66.0 82.9  
≥ 2 17.6 40.0 25.6 10.6 < 0.001
Sex over lifetime      
   Condom use      
Always/often 41.7 20.9 38.3 46.1 < 0.001
Never/rarely/sometime 52.8 74.8 55.9 48.4  
   Partner number      
1 56.9 15.7 40.7 71.8  
≥ 2 32.1 67.0 47.9 18.1 < 0.001
   Anal sex      
Yes 3.9 12.2 4.3 2.8 < 0.001
No 90.7 83.5 90.1 91.8  
   Partner's pregancy      
Yes 10.2 24.3 10.2 8.6 < 0.001
No/unsure 85.3 70.4 84.8 87.2  
   Partner's induced abortion      
Yes 9.6 23.5 9.8 8.0 < 0.001
No/unsure 85.6 70.4 84.7 87.8  
   Diagnosed with an STD      
Yes 1.3 7.0 1.6 0.6 < 0.001
No 89.3 86.1 87.8 90.5  
  1. a Data were shown in percentages, and the perentages of some items may not add up to 100 due to missing data.
  2. b Chi square test for linear trend in proportion.
  3. c n = 1409, 80, 500, 829, for Total, BHS, HS, Univ initiator, respectively.