Identification of knee osteoarthritis disability phenotypes regarding activity limitation: a cluster analysis

Table 1 Demographic data of participants and the subgroups

	All participants (N = 250)	1 (No disability) (N = 79)	2 (mild disability) (N = 67)	3 (moderate disability) (N = 76)	4 (severe disability) (N = 28)	P - values
Age (years)	65.44 (8.70)	66.7 (7.97)	66.49 (9.85)	64.55 (8.35)	62.8 (6.76)	0.112
BMI (kg/m²)	26.07 (4.36)	25.13 (3.61)	25.30 (4.48)	27.37 (4.95)	27.07 (3.53)	0.003^a
Duration of knee pain (years)	5.02 (3.78)	5.56 (4.24)	5.27 (3.72)	4.24 (3.14)	4.54 (3.18)	0.129
Gender (female/male)	216/34	67/12	57/10	68/8	24/4	.858

Note: Age, BMI and duration of pain were compared among subgroups using one-way ANOVA. Gender proportion was compared using Chi-square
^adifferent among subgroups at p < .05. Post-Hoc analysis showed differences between group 1 & 3, group 2 & 3, and group 2 & 4

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