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Table 2 Multivariate analyses predicting number of sexual partners and age at sexual debut

From: HPV vaccination has not increased sexual activity or accelerated sexual debut in a college-aged cohort of men and women

  Probability of sexual debut Number of sexual partners (per year) Age at sexual debut
Covariate Odds ratio 95%CI p-value Incidence ratio 95% CI p-value Hazard ratio 95% CI p-value
Intercept 0.61 (0.19, 1.96) 0.41 1.47 (0.98, 2.19) 0.06
Age (per year over 18) 1.48 (1.05, 2.14) 0.03 0.97 (0.89, 1.05) 0.42 0.88 (0.73, 1.07) 0.21
Female 0.85 (0.42, 1.68) 0.65 0.99 (0.82, 1.20) 0.94 0.90 (0.58, 1.42) 0.65
Race: white 1.78 (0.98, 3.27) 0.06 0.75 (0.63, 0.89) 0.001 1.51 (1.01, 2.28) 0.04
Alcohol: current drinker 2.73 (1.36, 5.56) 0.001 1.81 (1.36, 2.43) <0.001 1.65 (0.98, 2.80) 0.06
Alcohol: binge drinker 1.71 (0.64, 5.12) 0.30 0.99 (0.79, 1.22) 0.92 1.34 (0.82, 2.22) 0.25
Marijuana: ever user 1.27 (0.60, 2.70) 0.53 1.06 (0.86, 1.32) 0.57 1.13 (0.73,1.75) 0.58
Vaccinated
 At baseline 0.80 (0.41, 1.58) 0.52 0.81 (0.65, 1.00) 0.06
 At sexual debut 1.27 (0.86, 1.87) 0.23
  1. The probability of sexual debut is analyzed by logistic regression; values are given as odds ratios (exponentiated model coefficients). The number of sexual partners is analyzed with Poisson regression with an offset of (the log of) number of years sexually active; values are incidence rate ratios (exponentiated model coefficients). The age at sexual debut is analyzed by a Cox proportional hazard model; results given as hazard ratios (exponentiated model coefficients). Boldface indicate p < 0.05. Study conducted in 2015–17, Ann Arbor, MI