Skip to main content
. 2007 Mar 6;22(5):662–667. doi: 10.1007/s11606-007-0148-x

Table 3.

General Lineal Model Regression Analysis of Admission Cost and Length of Stay by Physician Group and Subject Characteristic; Percent Difference and Statistical Significance by Physician Group Pairs

  Physician group Physician group pairs*
Generalist (n = 5,536) Hospitalist (n = 11,565) Academician (n = 5,691) Hospitalist–Generalist Academician–Hospitalist Academician–Generalist
Cost LOS Cost LOS Cost LOS Cost LOS Cost LOS Cost LOS
Unadjusted arithmetic mean 4,814.3 4.4 4,613.9 3.9 3,307.4 2.7 −4.2 −18.2 −28.3 −30.8 −31.1 −38.6
Adjusted overall geometric mean 4,761.3 4.3 4,402.5 3.7 3,333.8§ 2.6§ −7.5 −14.0 −24.3 −29.7 −30.0 −39.5
Gender
Female 4,854.6 4.4 4,438.3 3.8 3,330.5§ 2.7§ −8.6 −13.6 −25.0 −28.9 −31.4 −38.6
Male 4,643.3 4.0 4,365.9 3.6 3,343.8§ 2.6§ −6.0 −10.0 −23.4 −27.8 −28.0 −35.0
Insurance
Commercial 4.0 3.5 2.9§ −12.5 −17.1 −27.5
Medicaid 4.2 3.8 2.7§ −9.5 −28.9 −35.7
Medicare 4.4 3.8 2.6§ −15.8 −31.6 −40.9
Severity
1 2,694.7 2.5 2,542.2 2.2 2,115.4§ 1.8§ −5.7 −12.0 −16.8 −18.2 −21.5 −28.0
2 3,629.2 3.4 3,339.3 3.0 2,534.7§ 2.1§ −8.0 −11.8 −24.1 −30.0 −30.2 −38.2
3 5,622.5 5.2 5,111.8 4.5 3,473.1§ 2.9§ −9.1 −13.5 −32.1 −35.6 −38.2 −44.2
4 9,543.1 6.9 8,893.3 6.8# 5,731.3§ 3.7§ −6.8 −1.4 −35.6 −45.6 −40.0 −46.4
Year
1 4,339.2 4.1 4,011.7 3.6 3,138.0§ 2.7§ −7.5 −12.2 −21.8 −25.0 −27.7 −34.1
2 4,610.0 4.3 4,226.5 3.8 3,242.4§ 2.7§ −8.3 −11.6 −23.3 −28.9 −29.7 −37.2
3 4,877.0 4.3 4,610.5** 3.7 3,390.5§ 2.5§ −5.5 −14.0 −26.5 −32.4 −30.5 −41.9
4 5,311.6 4.3 4,788.6 3.7 3,539.9§ 2.7§ −9.8 −14.0 −26.1 −27.0 −33.4 −37.2

LOS = length of stay

*Percent difference between mean pairs calculated as (Physician1 − Physician2 / Physician2)100.

Least squares means from general linear model of log-transformed cost and LOS adjusted for age as covariate, gender, insurance, year, all patient refined diagnosis related group (APRDRG), and severity nested in APRDRG. Ethnicity was not significant (P > .05) in cost or LOS model. Insurance was not significant in cost model

Hospitalist lower than Generalist at P < .001

§Academician lower than Generalist and Hospitalist each at P < .001

Hospitalist lower than Generalist at P = .25

Hospitalist lower than Generalist at P = .51

#Hospitalist lower than Generalist at P = .92

**Hospitalist lower than Generalist at P = .12