Table 1. Characteristics of All Community-Based Office Practices vs Hospital-Based Practices and of Physician-Owned vs Hospital-Owned Community-Based Office Practicesa.
| Variable | 1997-2011 | 1997-2013 | ||||
|---|---|---|---|---|---|---|
| All Community-Based Office Practices (n = 9783) [Reference] |
Hospital-Based Practices (n = 16 306) |
P Value | Physician-Owned Community-Based Office Practices (n = 10 395) |
Hospital-Owned Community-Based Office Practices (n = 1038) |
P Value | |
| Age, mean, y | 49.1 | 44.5 | <.001 | 49.7 | 49.6 | .88 |
| Female, % | 62.7 | 65.0 | .01 | 62.5 | 62.8 | .85 |
| Race/ethnicity, % | ||||||
| White | 77.8 | 72.5 | .001 | 76.5 | 85.4 | <.001 |
| Black | 10.2 | 15.1 | 10.7 | 8.7 | ||
| Hispanic | 7.6 | 9.2 | 8.2 | 3.2 | ||
| Other | 4.4 | 3.1 | 4.6 | 2.7 | ||
| Charlson comorbidity disease count, mean | 0.048 | 0.043 | .39 | 0.049 | 0.041 | .27 |
| Acute symptoms, % | 72.2 | 77.8 | .001 | 71.2 | 77.1 | .02 |
| Insurance status, % | .68 | |||||
| Private | 59.2 | 45.2 | <.001 | 58.1 | 60.3 | .08 |
| Medicare or Medicaid | 26.4 | 33.3 | 27.7 | 28.7 | ||
| Other | 14.4 | 21.6 | 14.2 | 10.9 | ||
| Clinician identifies as PCP, % | 81.9 | 52.7 | <.001 | 82.7 | 82.1 | .79 |
| Urban location, % | 81.7 | 74.9 | .05 | 82.4 | 79.4 | .40 |
| Geographic region, % | ||||||
| Northeast | 20.3 | 17.6 | .01 | 21.3 | 16.5 | <.001 |
| Midwest | 24.1 | 34.7 | 21.4 | 38.0 | ||
| South | 37.6 | 32.8 | 38.3 | 37.3 | ||
| West | 18.1 | 14.9 | 19.1 | 8.2 | ||
| Problem list items, %b | ||||||
| URTI | 36.0 | 38.1 | .20 | 35.3 | 37.8 | .31 |
| Back pain | 47.1 | 45.0 | .14 | 48.4 | 45.9 | .23 |
| Headache | 18.2 | 18.1 | .94 | 17.7 | 17.2 | .79 |
Abbreviations: PCP, primary care provider; URTI, upper respiratory tract infection.
a
Hospital-based outpatient practice data are only available from 1997 to 2011.
b
Symptom group proportions may not sum to 100% because a small number of patients fit into more than 1 category.