TABLE 4.

HRs and 95% CIs for the contribution of protein intake categories to transitions in self-reported difficulty climbing stairs¹

	Protein intake, g/kg aBW/d
	<0.8 (ref.)	0.8–0.99		1.0–1.19		≥1.2
	HR	HR	95% CI	HR	95% CI	HR	95% CI
	Incident mobility limitation (n = 1612)
Model 1	1.0	0.83	0.72, 0.96	0.83	0.72, 0.97	0.82	0.71, 0.95
Model 2	1.0	0.79	0.68, 0.92	0.74	0.62, 0.88	0.70	0.58, 0.85
Model 3	1.0	0.78	0.67, 0.92	0.76	0.63, 0.91	0.76	0.62, 0.92
	No mobility limitation to death (n = 608)
Model 1	1.0	1.18	0.84, 1.66	1.27	0.89, 1.81	1.13	0.80, 1.61
Model 2	1.0	1.16	0.81, 1.66	1.28	0.86, 1.91	1.07	0.67, 1.71
Model 3	1.0	1.16	0.83, 1.61	1.23	0.85, 1.79	1.12	0.73, 1.72
	Recovery from mobility limitation (n = 932)
Model 1	1.0	0.88	0.73, 1.07	0.84	0.68, 1.03	0.91	0.75, 1.10
Model 2	1.0	0.89	0.73, 1.09	0.86	0.68, 1.08	0.93	0.71, 1.20
Model 3	1.0	0.91	0.73, 1.13	0.92	0.72, 1.18	1.05	0.80, 1.38
	Mobility limitation to death (n = 598)
Model 1	1.0	0.89	0.75, 1.06	0.96	0.79, 1.17	0.92	0.77, 1.10
Model 2	1.0	0.98	0.81, 1.18	1.03	0.83, 1.28	1.07	0.85, 1.34
Model 3	1.0	1.01	0.83, 1.23	1.06	0.84, 1.33	1.12	0.88, 1.43

¹Multistate models were used to determine the association between protein intake and transitions in difficulty climbing stairs. Model 1 is adjusted for categories of adjusted protein intake, sex, age, and education. Model 2 is further adjusted for energy intake, smoking, and alcohol intake, and Model 3 is further adjusted for cognition, multimorbidity, and physical activity. aBW, adjusted body weight; ref., referent.