. Author manuscript; available in PMC: 2022 Jul 1.

Published in final edited form as: J Acquir Immune Defic Syndr. 2021 Jul 1;87(3):971–977. doi: 10.1097/QAI.0000000000002662

Table 3:

C-Statistic differences, Net Reclassification Improvement, and Integrated Discrimination Improvement between all models

	Difference in C-statistics		Continuous NRI		Category-based NRI		IDI
Models^a	Difference	95% CI	NRI	NRI 95% CI	NRI	NRI 95% CI	IDI	IDI 95% CI
Model 1 (vs Model 0)	−0.0112	(−0.0453, 0.023)	0.2726	(−0.0423, 0.5863)	−0.0145	(−0.1263, 0.1016)	0.0088	(0.0018, 0.0183)
Model 2 (vs Model 0)	−0.0077	(−0.0527, 0.0374)	0.2726	(−0.0423, 0.5863)	0.0066	(−0.1187, 0.148)	0.0082	(0.0021, 0.0154)
Model 3 (vs Model 0)	−0.0088	(−0.0539, 0.0362)	0.2351	(−0.0927, 0.5645)	−0.0335	(−0.1496, 0.0806)	0.009	(0.0024, 0.0179)
Model 4 (vs Model 0)	0.0029	(−0.0347, 0.0406)	0.2324	(−0.0698, 0.5299)	−0.0333	(−0.1676, 0.0977)	0.0062	(0.0003, 0.0141)

Model 0: Pooled Cohort Equations (PCEs) only, Model 1: PCEs + frailty score, Model 2: PCEs + frailty status, Model 3: PCEs + slow gait, Model 4: PCEs + weak grip

NRI = Net Reclassification Improvement

IDI = Integrated Discrimination Improvement

CI = Confidence Interval