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Table 4 Multivariate analysis on the association between risk characteristics and grade, divided by gender

From: Sexual behavior and awareness of Chinese university students in transition with implied risk of sexually transmitted diseases and HIV infection: A cross-sectional study

Risk characteristics Male Female
  Grade I Grade II Grade III Grade IV Pvalue* Grade I Grade II Grade III Grade IV Pvalue*
  Odds ratios (95% CI)†   Odds ratios (95% CI)  
Having first sex before university (referred to never or having first sex at university) 2.08 (1.43–3.02) 1.79 (1.23–2.59) 1.89 (1.31–2.75) 1 < 0.001 7.73 (2.80–21.33) 4.52 (1.63–12.58) 4.82 (1.73–13.44) 1 < 0.001
Ever had sex with a casual and/or commercial sex partner in previous year‡ (referred to having had only regular partner) 1.89 (1.03–3.47) 1.76 (1.01–3.10) 1.33 (0.78–2.29) 1 0.02 2.37 (0.40–14.04) 2.20 (0.42–11.68) 1.89 (0.36–9.92) 1 0.33
Having had ≥2 sexual partners in previous year‡ (referred to having had only one partner) 2.08 (1.16–3.72) 1.86 (1.08–3.20) 1.60 (0.96–2.68) 1 0.01 0.56 (0.22–1.42) 0.77 (0.36–1.68) 0.72 (0.34–1.50) 1 0.26
Never or rarely used condom in previous year‡ (referred to sometimes/often/always used) 1.87 (1.20–2.90) 1.39 (0.93–2.08) 1.14 (0.78–1.66) 1 0.003 1.98 (1.04–3.78) 1.43 (0.82–2.51) 1.12 (0.66–1.89) 1 0.03
Became aware of sex before high school (referred to becoming aware of sex in high school/at university) 1.66 (1.45–1.91) 1.27 (1.11–1.46) 0.98 (0.86–1.13) 1 < 0.001 2.11 (1.82–2.45) 1.37 (1.18–1.59) 1.19 (1.03–1.39) 1 < 0.001
Being exposed to pornographic media ≤16 year-old¶ (referred to never or being exposed ≥ 17 year-old) 1.66 (1.43–1.93) 1.12 (0.96–1.30) 1.02 (0.88–1.19) 1 < 0.001 3.24 (2.33–4.51) 2.09 (1.49–2.92) 1.69 (1.20–2.38) 1 < 0.001
Being exposed to pornographic website ≤16 year-old (referred to never or being exposed ≥ 17 year-old) 6.09 (3.94–9.41) 3.29 (2.12–5.13) 1.44 (0.90–2.30) 1 < 0.001 3.66 (1.07–12.58) 2.16 (0.61–7.58) 0.59 (0.13–2.66) 1 < 0.01
Disapproved high school students' sex (referred to approved or did not know) 0.93 (0.80–1.08) 0.91 (0.78–1.06) 0.84 (0.72–0.98) 1 0.09 0.86 (0.69–1.06) 1.06 (0.86–1.32) 0.96 (0.78–1.20) 1 0.27
  1. * P value is calculated using linear contrast statistics.
  2. † Odds ratio with 95% confidence interval in parentheses is adjusted for university, faculty, residential area, and family's economic status.
  3. ‡ Among students sexually active in the previous year.
  4. ¶ Including pornographic novel, magazine, and/or video.