Patellar Tendon Properties and Lower Limb Function in Rheumatoid Arthritis and Ankylosing Spondylitis versus Healthy Controls: A Cross-Sectional Study

Table 2

Habitual physical activity and subjective and objective physical function. Presented are the results (mean ± SEM) of RA (𝑛=18; 13 women) and AS (𝑛=12; 4 women) patients and their respective age- and sex-matched healthy controls.

	RA study			AS study
	RA patients	Healthy controls	𝑃 value	AS patients	Healthy controls	𝑃 value
	(𝑛 = 18)	(𝑛 = 18)		(𝑛 = 12)	(𝑛 = 12)
Habitual physical activity (range 2–8)	4.9 ± 0.7	4.4 ± 1.4	0.17	4.6 ± 0.4	4.3 ± 0.3	0.46
30-sec and sit-to-stand (𝑛)	12.8 ± 0.8	13.7 ± 0.4	0.3	11.8 ± 0.7	15.8 ± 1.1	0.002
8-foot-up-and-go (sec)	6.0 ± 0.3	5.2 ± 0.2	0.03	5.3 ± 0.3	4.6 ± 0.2	0.03
50-foot-walk (sec)	9.2 ± 0.5	7.4 ± 0.3	0.004	7.9 ± 0.4	6.6 ± 0.4	0.03
One-leg balance (cumulative) (sec)	50.2 ± 5.6	66.9 ± 6.3	0.04	74.9 ± 4.5	78.7 ± 6.2	0.62
mHAQ (range 0–3)	0.60 ± 0.06	0.18 ± 0.03	<0.001	0.56 ± 0.12	0.17 ± 0.0	<0.01
SF-36 physical component (range 22–59)	38.1 ± 3.3	51.3 ± 1.9	<0.001	41.6 ± 3.6	50.7 ± 1.6	0.04
SF-36 mental component (range 11–62)	39.6 ± 2.8	43.2 ± 1.5	0.11	34.7 ± 3.1	44.3 ± 1.3	0.03