The Combination of ¹⁸F-Fluorodeoxyglucose Positron Emission Tomography Metabolic and Clinical Parameters Can Effectively Distinguish Rheumatoid Arthritis and Polymyalgia Rheumatic

Table 1

The differences in demographics between rheumatoid arthritis (RA), polymyalgia rheumatic (PMR), and control, and clinical parameters between RA and PMR.

Characteristic	RA (n = 23)	PMR (n = 31)	Control (n = 50)	P value
Demographics
Age	65.8 ± 8.5	68.8 ± 9.5	68.7 ± 9.9	0.530
Male (n%)	13 (56.5%)	12 (38.7%)	20 (40.0%)	0.345
Clinical parameters
HGB (g/L)	111.0 ± 23.1	103.6 ± 17.7	—	0.248
WBC (10^9/L)	7.3 ± 2.9	15.9 ± 27.7	—	0.046
PLT (10^9/L)	274.2 ± 115.1	317.9 ± 96.6	—	0.091
NEUT (10^9/L)	0.7 ± 0.1	0.9 ± 0.8	—	0.411
LYM (10^9/L)	0.2 ± 0.1	0.5 ± 1.3	—	0.972
CRP (mg/dL)	3.6 ± 5.0	5.5 ± 5.4	—	0.049
ESR (mm/h)	49.4 ± 37.0	61.7 ± 29.6	—	0.132
IGG (mg/dl)	1403.6 ± 610.5	1400.7 ± 340.0	—	0.733
RF positive (n%)	14 (60.9%)	1 (3.2%)	—	<0.001
AKA positive (n%)	10 (43.5%)	0 (0.0%)	—	<0.001
anti-CCP Ab positive (n%)	15 (65.2%)	2 (6.5%)	—	<0.001
ANCA positive (n%)	12 (52.2%)	5 (16.1%)	—	0.007

Variance analysis. HGB: hemoglobin; WBC: white blood cell; PLT: platelet; NEUT: neutrophil; LYM: lymphocyte; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; IgG: immunoglobulin G; RF: rheumatoid factor; AKA: anti-keratin antibody; anti-CCP Ab: anti-cyclic citrullinated peptide antibody; ANCA: anti-neutrophil cytoplasmic antibodies. The significance of bold values is P < 0.05, which means differences were considered statistically significant.