. Author manuscript; available in PMC: 2018 May 9.

Published in final edited form as: Int Forum Allergy Rhinol. 2015 Oct 13;6(1):52–57. doi: 10.1002/alr.21620

TABLE 3.

Physical component score: comparison of the Functional Index and the Charlson Index^*

	Functional Index	Charlson Index
Spearman correlation (r_s)	−0.49^a	−0.35^a
Coefficient of determination (R²)	0.24	0.12
Adjusted coefficient of determination (R²)	0.21	0.15
Bootstrapped distribution of the adjusted coefficient of determination (mean ± standard error)	0.21 ± 0.09^b	0.15 ± 0.07^b

Spearman correlation between each index and the SF-36 Physical Component Score. Negative correlations indicate that as the number of comorbidities increases (higher index score) the level of self-reported health status decreases (lower Physical Component Score). Coefficients of determination generated by multiple linear regression, adjusted for age, gender, race, and ethnicity.

Correlation significantly different from zero, p < 0.001.

Difference between indexes statistically significant, p < 0.001.

SF-36 = Medical Outcomes Study 36-Item Short Form Health Survey.