Table 4

First Set of Regression Results. Control Variables Only (Second Set from Same Regression included in Table 5)a

Covariate

Linear Regression Coefficient

Lower 95% Confidence Limit

Upper 95% Confidence Limit


age <35

0.146*

0.009

0.283

age 35 to 44

0.100**

0.038

0.161

age 45 to 54

referent

referent

referent

age 55 to 64

0.084*

0.014

0.153

age 65 to 74

0.132*

0.030

0.235

age 75+

0.104

-0.113

0.321

White, non-Hispanic

referent

referent

referent

African-American, non-Hispanic

-0.096

-0.204

0.013

Hispanic

0.011

-0.079

0.102

Asian, Pacific Island, non-Hispanic

0.017

-0.076

0.109

Other race/ethnic

-0.185**

-0.310

-0.060

Male

0.057

-0.012

0.125

New England

-0.024

-0.159

0.110

Middle Atlantic

-0.065

-0.168

0.038

East North Central

-0.001

-0.123

0.122

West North Central

0.082

-0.075

0.239

South Atlantic

-0.058

-0.178

0.061

East South Central

0.143*

0.033

0.252

West South Central

0.017

-0.099

0.133

Mountain

-0.001

-0.142

0.139

Pacific

referent

referent

referent

Rural/town

0.054

-0.054

0.163

Board certified

0.057

-0.019

0.133

Foreign school graduate

-0.053

-0.134

0.028

Continuous income up to $400,000 ($100,000 units)

0.073***

0.035

0.111

Top income $400,000+, binary

0.005

-0.112

0.123

Work hours ≤ 40

0.017

-0.045

0.080

Work hours 41-50

referent

referent

referent

Work hours 51-60

-0.114*

-0.204

-0.024

Work hours >60

-0.201***

-0.280

-0.122

Full owner

-0.076*

-0.141

-0.010

Partner

0.023

-0.052

0.099

Currently employed by medical school

0.105*

0.001

0.209

Percent revenue managed care 20 percent units

-0.020*

-0.038

-0.002


aP-value legend: *** = <0.001; ** = (0.001-0.01); * = (0.01-0.05); F-statistic with 71 and 1602 degrees of freedom = 10.61, p < 0.0001

Leigh et al. BMC Health Services Research 2009 9:166   doi:10.1186/1472-6963-9-166

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