Multivariable Logistic Regression Results Predicting Low-Value Prostate-Specific Antigen Blood Test and Digital Rectal Exam (Unweighted n = 2,964, Weighted n = 121,633,833)
| Prostate-Specific Antigen (PSA) | Digital Rectal Exam (DRE) | |||
|---|---|---|---|---|
| Variable | Odds Ratio | 99.5% Confidence Limits | Point Estimate | 99.5% Confidence Limits |
| Cancer—yes | 1.53 | 0.52–4.52 | – | – |
| Age | 0.95 | 0.90, 1.00 | – | – |
| Number of previous visits | 0.96 | 0.88, 1.04 | 0.92* | 0.85, 0.996* |
| Number of services provided* | 1.49* | 1.33, 1.67* | 1.37* | 1.15, 1.63* |
| Time spent with physician | 1.01 | 0.98, 1.04 | 1.02 | 0.98, 1.06 |
| Reason for visit—new problem | Ref | Ref | Ref | Ref |
| Preventive visit | 1.01 | 0.30, 3.34 | 3.34 | 0.85, 13.18 |
| Chronic problem, routine | 0.64 | 0.20, 2.12 | 0.63 | 0.15, 2.62 |
| Chronic problem, flare-up | 0.37 | 0.07, 2.00 | 3.53 | 0.45, 27.92 |
| DRE—yes | 0.64 | 0.07, 5.57 | – | – |
| Solo—yes | – | – | 3.03 | 0.63, 14.61 |
| PSA—yes | – | – | 0.72 | 0.10, 5.45 |
| Nurse practitioner included in visit—yes | – | – | 3.95 | 0.31, 50.78 |
*Statistically significant at P < .005 level.