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Table 5 Theory of Planned Behavior Predictors (n = 427)

From: A national physician survey on prescribing syringes as an HIV prevention measure

  MDs willing Rx (n = 267) MDs not willing (n = 160) unadj OR 95% CI adj OR* 95% CI
Measures n % n %    (n = 425 for model)
Attitude Scale (3 item) 2.45 2.05–2.94 1.81 1.47–2.22
> = 50 200 75.2% 33 20.6%     (chisq = 31.9)
<50 66 24.8% 127 79.4%     
      2.24 1.87–2.70 1.53 1.23 – 1.89
Subjective Norms Scale (4 item)     
= 50 203 76.6% 56 35.0%     (chisq = 14.7)
<50 62 23.4% 104 65.0%     
      2.93 2.36–3.65 2.00 1.59 – 2.51
Perceived Control Scale (4 item)     
> = 50 206 77.7% 33 20.6%     (chisq = 35.4)
<50 59 22.3% 127 79.4%     
  1. *odds ratio and 95% CI are for a 10 point increase in the scale
  2. ROC for model = .902