Table 2. Unadjusted and Adjusted Use Rates by Stratified Practice Setting, 1997-2011.
| Variable | Unadjusteda | Adjustedb | ||||
|---|---|---|---|---|---|---|
| Community-Based Practice (n = 9783) [Reference] |
Hospital-Based Practices (n = 16 306) |
P Value | Community-Based Practice (n = 9783) [Reference] |
Hospital-Based Practices (n = 16 306) | aOR (95% CI) | |
| Antibiotics for URTI | 1684/3389 (49.1) | 2898/6023 (52.1) | .16 | 49.4 | 49.2 | 0.99 (0.82-1.21) |
| CT or MRI for back pain or headachec | 404/6443 (6.3) | 726/10 346 (8.3) | .01 | 5.8 | 8.2 | 1.44 (1.13-1.85) |
| Radiographs for back painc | 775/8123 (9.9) | 1689/13 451 (12.8) | <.001 | 9.5 | 12.9 | 1.41 (1.16-1.71) |
| Specialty referrals for all 3 conditionsc | 740/9783 (7.6) | 3128/16 306 (19.0) | <.001 | 7.1 | 17.3 | 2.74 (2.23-3.36) |
Abbreviations: aOR, adjusted odds ratio; CT, computed tomography; MRI, magnetic resonance imaging; URTI, upper respiratory tract infection.
a
Presented as unadjusted sample numerator divided by sample denominator (percentage). Percentages may not equal the value of the numerator divided by the denominator because they are population weighted.
b
Presented as multivariable-adjusted use rates and aOR. Models are adjusted for age, sex, race/ethnicity, insurance status, symptom acuity, comorbidities, geographic region, urban location, and whether the generalist was the patient’s usual primary care provider.
c
Comparisons with P < .05.