Table 3.

Results of the explanatory factor structure by principal component analysis with loadings (n = 549)

Item		Factor 1	Factor 2	Factor 3
1	Pain/stiffness during the day	0.45
2	Pain/stiffness during the night			− 0.86
3	Walking	0.85
4	Washing/dressing			− 0.39
5	Physical activity levels	0.84
6	Work/daily routine	0.65
7	Social activities and hobbies	0.59
8	Needing help	0.41
9	Sleep			− 0.89
10	Fatigue or low energy			− 0.58
11	Emotional well-being		0.42
12	Understanding of your condition and any current treatment		0.88
13	Confidence in being able to manage symptoms		0.84
14	Overall impact	0.48

Extraction Method: principal component analysis; oblique rotation with Kaiser normalization. Values below 0.3 are suppressed. The model explained 60% of the total variance; factor 1 explained 38%, factor 2 = 12% and factor 3 = 10%