Table 2.

Phenotypes according to the clustered activity limitations

	Cluster
	1 (No disability) (N = 79)	2 (mild disability) (N = 67)	3 (moderate disability) (N = 76)	4 (severe disability) (N = 28)
the difficulty level of maintaining a standing position: median (Q1, Q3)	0 (0,0)	1(1,1)	2 (2,2)	3 (3,3)
stair climbing time (seconds): mean	12.43	15.29	18.01	18.23
walking time (seconds): mean	53.72	58.51	63.37	71.02