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Table 3 Multivariate analyses assessing the effects of timing of sexual initiation on subsequent sexual behavior 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 BHS HS Univ
  Adjusted Odds Ratio (95% Confidence Interval)
Partner type first sexa    
   Non-regular vs. regular 5.24 (3.28–8.36) 1.90 (1.40–2.59) 1.00
Condom use first sexa    
   Not used/unsure vs. used 2.55 (1.50–4.33) 1.30 (1.03–1.64) 1.00
Partner type recent sexa    
   Non-regular vs. regular 3.70(2.22–6.15) 1.36 (0.96–1.95) 1.00
Condom use recent sexa    
   Not used vs. used 1.62 (1.05–2.52) 1.06 (0.85–1.33) 1.00
Partner type last yearb    
   Non-regular vs. regular 1.01 (0.40–2.54) 0.96 (0.61–1.53) 1.00
Condom use last yearb    
   Never/rarely/sometime vs. always/often 3.28 (1.36–7.89) 1.24 (0.88–1.73) 1.00
OC use by partner last yearb    
   Never/rarely/sometime vs. always/often 2.68 (1.03–6.98) 1.40 (0.96–2.06) 1.00
Partner number last yearb    
   ≥ 2 vs. 1 1.44 (0.58–3.62) 1.43 (0.93–2.21) 1.00
Condom use lifetimeb    
   Never/rarely/sometimes vs. always/often 3.55 (1.74–7.26) 1.17 (0.88–1.56) 1.00
Partner number lifetimeb    
   ≥ 2 vs.1 4.19 (1.84–9.54) 2.81 (2.02–3.89) 1.00
Anal sex lifetimeb    
   Yes vs. no 2.28 (0.63–8.23) 1.15 (0.55–2.42) 1.00
Partner's pregancy lifetimeb    
   Yes vs. no/unsure 2.89 (1.21–6.94) 1.42 (0.91–2.22) 1.00
Partner's induced abortion lifetimeb    
   Yes vs. no/unsure 2.95 (1.20–7.26) 1.48 (0.93–2.36) 1.00
Diagnosed with an STD lifetimeb    
   Yes vs. no 26.13 (2.94–232.09) 5.11 (1.20–2.76) 1.00
  1. a Odds ratio with 95% confidence interval in parentheses is adjusted for university, grade, faculty, hometown area, and family economic status.
  2. b Odds ratio with 95% confidence interval in parentheses is further adjusted for the duration of sexual experience.