Table 5.

Performance of the RDCI for predicting Multidimensional Health Assessment Questionnaire scores

Model	N/N observations	β for RDCI (95% CI)	P value	Model QICu (No RDCI)	Model QICu (RDCI)	ΔQICu
ICD-9-CM	931/8,769
Age, sex, & race		0.06 (0.04, 0.08)	<0.001	3,485.37	3,383.86	−101.51
Fully adjusted*		0.06 (0.04, 0.08)	<0.001	3,435.45	3,346.33	−89.12
ICD-10-CM	1,175/6,864
Age, sex, & race		0.07 (0.05, 0.09)	<0.001	2,567.83	2,463.43	−104.4
Fully adjusted*		0.07 (0.05, 0.09)	<0.001	2,510.82	2,417.62	−93.2

Values are from generalized estimating equations models.

^*Model includes age, sex, race, smoking status, conventional synthetic DMARDS, biologic or targeted synthetic DMARDs, glucocorticoids, and anti-CCP antibody.

Abbreviations: CI = Confidence Interval; COEFF = Coefficient; ICD-9-CM = International Classification of Diseases, Ninth Revision, Clinical Modification; ICD-10-CM = International Classification of Diseases, Tenth Revision, Clinical Modification; QIC = Quasi Information Criterion; RDCI = Rheumatic Disease

Comorbidity Index