Table 3.

The association of RA and contributing factors on univariable logistic regression (enter method)

	B	OR (95% C.I.)	p
Sex*	0.030	1.030 (0.611–1.739)	0.911
Age#	0.035	1.035 (0.886–1.210)	0.661
Duration of pain (years)	0.052	1.054 (0.995–1.116)	0.074
Tenosynovitis
2P-BS	3.610	36.981 (11.268–121.373)	< 0.001
P/Ex	0.977	2.657 (1.639–4.306)	< 0.001
RF†	1.694	5.439 (4.023–7.353)	< 0.001
ACPA†	2.436	11.423 (7.770–16.795)	< 0.001
CRP‡	1.832	6.244 (3.648–10.689)	< 0.001
ESR‡	1.802	6.064 (3.854–9.541)	< 0.001

RA rheumatoid arthritis, OR Odds ratio, C.I. confidence interval, 2P-BS two-phase bone scintigraphy, P/Ex physical examination, RF rheumatoid factor, ACPA anti-cyclic citrullinated protein antibody, CRP C-reactive protein, ESR estimated sedimentation rate

^*Sex was divided into male and female

^#Age was grouped into intervals of 10 years

^†RF and ACPA were divided into negative with their normal references (≤ 15 IU/mL and < 25 U/mL, respectively), low-positive (higher than the upper normal reference but ≤ 3 times), and high-positive (> 3 times the upper normal reference)

^‡CRP and ESR were into normal when their values were within their normal ranges (≤ 0.8 mg/dL and 20 mm/h respectively). Higher values than the normal ranges were defined as abnormal