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Table 5 Summary of variances explained and model fit by method and model, developmental sample

From: Improving multimorbidity measurement using individualized disease-specific quality of life impact assessments: predictive validity of a new comorbidity index

Model & Description

dfa

Cross-sectional models N = 5490

Longitudinal models N = 2170

MCS

PCS

MCS

PCS

Adj R2

AIC

Adj R2

AIC

Adj R2

AIC

Adj R2

AIC

QDIS-MCC Models

0

Base model—sociodemographic variables onlyb

12

0.08

40,181

0.09

40,905

0.06

15,970

0.09

16,145

1

Simple chronic conditions count

13

0.22

39,221

0.31

39,400

0.17

15,691

0.26

15,675

2–M/P

Population-weighted MCS/PCS scorec

47

0.31

38,560

0.39

38,656

0.25

15,479

0.34

15,433

3d

Individualized QDIS-weighted MCC score

13

0.33

38,435

0.42

38,460

0.26

15,438

0.36

15,383

Charlson Models

1C

Charlson 12 count

13

0.13

39,858

0.18

40,340

0.10

15,884

0.15

15,987

2C–M/P

MCS-/PCS-weighted Charlson score

24

0.13

39,817

0.19

40,237

0.10

15,861

0.16

15,970

3C

Individualized QDIS-weighted Charlson score

13

0.20

39,420

0.29

39,543

0.17

15,705

0.23

15,770

4C

Mortality-weighted Charlson score

13

0.12

39,912

0.16

40,447

0.09

15,889

0.14

16,016

  1. MCS  Short Form-8 Mental Component Score, PCS  Short Form-8 Physical Component Score. F-ratios for QDIS-MCC and Charlson models not reported, all p < .001
  2. adf = degrees of freedom in the numerator
  3. bBase model holdout group (female) was female, age 45–64, white, and high-school graduate
  4. cThese weights from developmental sample regressions at baseline were used for all Model 2 comparisons, cross-sectional and longitudinal including cross-validations
  5. dModel 3 used developmental sample baseline individualized QDIS scores weights (see text). All models adjusted for Base model main effects of (# of categories): age (6), gender (2), education (4) race (4). Intercept (holdout group) was ages 18–34 years, female, with 12 years of education and white. Intercept values (constants) varied across models, from 43.8 to 52.8 for PCS and from 45.8 to 52.7 for MCS. Values were lowest for Base and highest for Model 3, respectively