Table 2

C-statistic from logistic regression models predicting six-month mortalitya

Sample

Analytic file used to code risk adjustersb

Summary score

Condition indicators


CMS-HCC

    Charlson

    Elixhauser

CMS-HCC

Charlson

Elixhauser


All patientsc (N = 170,342)


1) IPindex

0.799

0.728**

0.680**

0.827

0.743**

0.757**

(0.796, 0.802)

(0.725, 0.731)

(0.677, 0.684)

(0.824, 0.830)

(0.740, 0.746)

(0.754, 0.760)

2) IPpre12mo+index

0.790

0.739**

0.7**

0.825

0.753**

0.766**

(0.787, 0.793)

(0.736, 0.742)

(0.696, 0.703)

(0.823, 0.828)

(0.749, 0.756)

(0.763, 0.769)

3) IP+OPpre12mo +index

0.774

0.735**

0.719**

0.819

0.754**

0.777**

(0.771, 0.777)

(0.732, 0.738)

(0.716, 0.722)

(0.816, 0.822)

(0.751, 0.757)

(0.774, 0.780)

4) IP+OPpre12mo

0.716

0.711**

0.696**

0.745

0.726**

0.739**

(0.712, 0.719)

(0.717, 0.714)

(0.692, 0.699)

(0.742, 0.748)

(0.722, 0.729)

(0.736, 0.743)

DM (N = 2,339)

1) IPindex

0.736

0.706**

0.685**

0.796

0.721**

0.753**

(0.712, 0.763)

(0.676, 0.734)

(0.654, 0.712)

(0.786, 0.832)

(0.699, 0.753)

(0.736, 0.787)

2) IPpre12mo+index

0.74

0.724**

0.7**

0.796

0.739**

0.758**

(0.719, 0.773)

(0.701, 0.755)

(0.679, 0.736)

(0.795, 0.84)

(0.723, 0.777)

(0.749, 0.797)

3) IP+OPpre12mo +index

0.733

0.72**

0.699**

NA

NA

0.762

(0.712, 0.767)

(0.697, 0.749)

(0.678, 0.733)

(0.752, 0.799)

4) IP+OPpre12mo

0.703

0.698**

0.682**

NA

0.722**

0.737**

(0.681, 0.742)

(0.676, 0.731)

(0.66, 0.719)

(0.708, 0.761)

(0.729, 0.78)

Stroke (N = 9,828)

1) IPindex

0.79

0.667**

0.662**

0.842

0.682**

0.728**

(0.776, 0.799)

(0.651, 0.679)

(0.647, 0.675)

(0.833, 0.853)

(0.668, 0.695)

(0.717, 0.742)

2) IPpre12mo+index

0.774

0.683**

0.684**

0.841

0.701**

0.736**

(0.76, 0.784)

(0.67, 0.696)

(0.672, 0.698)

(0.832, 0.853)

(0.691, 0.716)

(0.725, 0.75)

3) IP+OPpre12mo +index

0.752

0.679**

0.693**

0.83

0.712**

0.739**

(0.739, 0.763)

(0.665, 0.692)

(0.682, 0.708)

(0.821, 0.842)

(0.699, 0.725)

(0.729, 0.754)

4) IP+OPpre12mo

0.688

0.675**

0.679**

0.718

0.706**

0.709**

(0.677, 0.703)

(0.662, 0.689)

(0.668, 0.695)

(0.712, 0.737)

(0.693, 0.719)

(0.701, 0.726)


AMI (N = 5,749)


1) IPindex

0.777

0.692**

0.678**

0.811

0.704**

0.749**

(0.763, 0.789)

(0.677, 0.707)

(0.661, 0.693)

(0.801, 0.826)

(0.69, 0.721)

(0.736, 0.764)

2) IPpre12mo+index

0.776

0.71**

0.705**

0.814

0.719**

0.75**

(0.763, 0.789)

(0.695, 0.725)

(0.691, 0.721)

(0.805, 0.83)

(0.706, 0.736)

(0.738, 0.767)

3) IP+OPpre12mo +index

0.77

0.713**

0.727**

0.813

0.725**

0.763**

(0.757, 0.783)

(0.699, 0.729)

(0.714, 0.742)

(0.805, 0.829)

(0.713, 0.743)

(0.752, 0.78)

4) IP+OPpre12mo

0.72

0.707**

0.712**

0.741

0.717**

0.732**

(0.706, 0.737)

(0.693, 0.723)

(0.698, 0.728)

(0.736, 0.764)

(0.705, 0.735)

(0.721, 0.751)

CHF(N = 11,287)

1) IPindex

0.685

0.653**

0.642**

0.719

0.669**

0.7**

(0.675, 0.697)

(0.642, 0.665)

(0.631, 0.654)

(0.712, 0.733)

(0.659, 0.681)

(0.69, 0.712)

2) IPpre12mo+index

0.694

0.671**

0.668**

0.725

0.681**

0.709**

(0.685, 0.707)

(0.661, 0.684)

(0.658, 0.681)

(0.719, 0.739)

(0.673, 0.695)

(0.701, 0.723)

3) IP+OPpre12mo +index

0.69

0.666**

0.671**

0.721

0.679**

0.702**

(0.682, 0.704)

(0.656, 0.679)

(0.662, 0.685)

(0.715, 0.736)

(0.671, 0.693)

(0.695, 0.716)

4) IP+OPpre12mo

0.674

0.663**

0.664**

0.698

0.675**

0.688**

(0.665, 0.689)

(0.654, 0.677)

(0.655, 0.679)

(0.694, 0.715)

(0.667, 0.69)

(0.682, 0.704)


Note: **: The c-statistic is significantly different from the c-statistic of CMS-HCC model at the 5% level;

NA: Models did not converge due to complete (or quasi-complete) separation.

a. 95% confidence intervals of c-statistics are in parentheses.

b. Four analytic files were used to code risk adjusters: "IPindex" only included claims from the index hospitalization for each of the four disease samples. "IPpre12mo+index" included all inpatient claims in the 12 months prior to the index hospitalization including the index admission date. "IP+OPpre12mo+index" included all inpatient and outpatient claims in the 12 months prior to the index hospitalization including the index admission date. "IP+OPpre12mo " included all inpatient and outpatient claims in the 12 months prior to the index hospitalization excluding the index admission date.

c. Patients with any hospital admission between January 1st, 2006 and June 30th, 2006.

Li et al. BMC Health Services Research 2010 10:245   doi:10.1186/1472-6963-10-245

Open Data