Model 1 Model 2 Model 3
Personal characteristics      
  Age 1.02 (0.99,1.04) 1.01 (0.99,1.04) 1.01 (0.99,1.04)
  College graduate (yes vs. no) 0.44 (0.28,0.71) 0.40 (0.25,0.68) 0.41 (0.24,0.67)
  Non-Hispanic White 2.25 (0.99,5.12) 2.27 (0.98,5.27) 2.30 (0.99,5.35)
  HIV-positive 6.53 (3.66,11.63) 2.88 (1.46,5.69) 2.95 (1.48,5.86)
Sexual risk behavior (past 6 months)      
  Serodiscordant insertive UAI   2.59 (1.48,4.53) 2.58 (1.47,4.54)
  Serodiscordant receptive UAI   2.85 (1.59,5.10) 2.69 (1.49,4.87)
  Drug use during sexual activities   1.37 (0.79,2.37) 1.31 (0.76,2.28)
Ever had casual sex at these venues      
  Sex club/bathhouse   0.74 (0.41,1.35) 0.71 (0.39,1.30)
  Park/Outdoor cruising location   2.12 (1.21,3.72) 2.26 (1.28,3.98)
  Leather, fetish, BDSM bar or event   1.03 (0.50,2.15) 1.06 (0.51,2.22)
Normative masculinity (high vs. low/moderate)     2.41 (1.46,3.97)
Model Chi-square (df) 62.51 (4) 108.33 (10) 119.35 (11)
-2 log L 510.89 465.08 454.06
Δ -2 log L   45.81a 11.02b
Note. Values are adjusted odds ratios (95% CI); bolded values indicate statistically significant Wald Chi-square (p< 0.05)
aG = 510.89 - 465.08 = 45.81, distributed as Chi-square with 10 - 4 degrees of freedom, p<0.001
bG = 465.08 - 454.06 = 11.02, distributed as Chi-square with 11 - 10 degrees of freedom, p<0.001
Table 2: Nested logistic regression models of barebacker identification on personal characteristics, sexual risk behaviors, and normative masculinity (N = 886).
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