Results of the Regression Analysis.
| Coefficient | 95% CI | |
|---|---|---|
| Physician work effort | ||
| Total annual visits | $12.06 | $10.17–$13.96 |
| Total annual hours worked | $1.13 | ($4.83)–$7.08 |
| Provider characteristics | ||
| Years in medical practice (10 to 15 years is referent) | ||
| Less than 5 years | ($38,339) | ($64,237)–($12,440) |
| 5 to 9 years | ($3,887) | ($16,092)–$8,318 |
| 10 to 19 years | $6,672 | ($7,103)–$20,446 |
| 20 to 24 years | ($520) | ($12,643)–$11,604 |
| 25 to 29 years | $1,038 | ($18,229)–$20,305 |
| 30 to 34 years | ($15,411) | ($31,688)–$865 |
| 35 to 39 years | ($34,419) | ($63,795)–($5,042) |
| 40 years or more | ($19,353) | ($43,563)–$4,858 |
| Ownership interest, and board certification | ||
| Physician is an employee | ($5,848) | ($14,491)–$2,795 |
| Physician is board certified | $15,980 | $4,173–$27,788 |
| Practice characteristics | ||
| Northeast census region | ($17,043) | ($30,077)–($4,009) |
| North Central census region | ($14,576) | ($24,816)–($4,336) |
| Western census region | ($9,856) | ($20,933)–$1,221 |
| Less than 50,000 population | ($5,643) | ($16,638)–$5,352 |
| Population between 50,000 and 500,000 | ($13,756) | ($23,086)–($4,426) |
| Service population | ||
| 1% increase in patient population on Medicaid | ($187) | ($479)–$105 |
| Proportion providing Medicare services | $5,013 | ($27,725)–$37,752 |
| Race/gendercharacteristics (white male is referent) | ||
| Black male | $9,309 | ($18,410)–$37,028 |
| White female | ($14,579) | ($25,969)–($3,189) |
| Black female | ($36,963) | ($71,450)–($2,476) |
* Our regression model used consumer price index adjusted annual income (2004 dollars) as the dependent variable. Coefficients are denominated in 2004 dollars. Parentheses indicate negative values. Adjusted R square for the model = 0.28.