Table 1

Characteristics of the study groups

	Overall (n=293)					Female (n=173)					Male (n=120)
	Patients with foot pain and RA		Patients with foot pain but no RA (control group)		P value	Patients with foot pain and RA		Patients with foot pain but no RA (control group)		P value	Patients with foot pain and RA		Patients with foot pain but no RA (control group)		P value
	Median	IQR	Median	IQR	P value	Median	IQR	Median	IQR	P value	Median	IQR	Median	IQR	P value
Age (years)	59	16	53	21	0.003*	59	16	53	21	<0.001*	58	16	53.5	24	0.845
Height (cm)	162	10	162	10	0.401	160	10	160.5	9	0.236	170	10	171	15	0.578
Weight (kg)	70	19	65	15	0.168	65	15	62.5	11	0.334	78	18	76.5	13	0.35
General VAS (0–100)	6	3	1.5	4	<0.001*	6	3	2	5	<0.001*	5	4	0	1	<0.001*
Hand VAS	6	3	0	3	<0.001*	6	4	1	3	<0.001*	5	4	0	1	<0.001*
Feet VAS	6	5	2	5	<0.001*	6	4	2	5	<0.001*	4	5	0	1	<0.001*
MFPDI	21	18	4	10	<0.001*	22	17	4.5	11	<0.001*	19	18	0.5	6	<0.001*
FFI total	43.91	45	6.52	18	<0.001*	48.3	39	9.1	23	<0.001*	30.4	51	0	5	<0.001*
FFI pain	48	38	8	29	<0.001*	50	34	14	33	<0.001*	41.5	47	0	4	<0.001*
FFI disability	49	58	0	14	<0.001*	51	50	2	18	<0.001*	24	56	0	0	<0.001*
FFI physical activity	6	19	0	2	<0.0018	7	20	0	2	<0.001*	3	15	0	0	<0.001*
W/b r/foot	242	22	244	18	0.339	237	15	240.5	17	0.037	261	18	261	22	0.777
W/b first MTPJ r/foot	180	16	180.5	15	0.843	178	11	177	14	0.849	195.5	14	189.5	19	0.9
W/b r/MF height	53.8	9.7	56.265	10.31	<0.001*	51.4	8.2	54.4	9.4	0.007*	58.8	6.3	65.8	16	0.004*
W/b r/MF width	77	8.63	74.965	8.93	0.035*	75.5	6.7	73.9	6.9	0.03*	83.5	7.2	81.5	8.7	0.559
W/b r/forefoot	91.38	9.34	91.69	7.08	0.508	89.7	7	88.5	6.8	0.589	97.3	7.8	96.4	7.4	0.941
W/b r/hindfoot	66.52	7.29	66.105	6.16	0.089	65.7	6.2	65.2	6.6	0.157	71.8	7.6	68.5	4.2	0.39
FPI total (r/foot)	5	7	5	4	0.338	5	6	5	5	0.807	2	8	5	3	0.205

*Mann-Whitney U test. Significance p<0.05
FFI, Foot Function Index; FPI, Foot Posture Index; MF, midfoot; MFPDI, Manchester Foot Pain Disability Index; MTPJ, metatarsophalangeal joints; r/, right; RA, rheumatoid arthritis; VAS, Visual Analogue Scale; W/b, weight-bearing.