Table 2: Some diagnostic performance of laboratory variables in rheumatoid arthritis

Rheumatic factor

RA untreated group

Number of patients 35
Rheumatic factor

RA groupsero-

Number of patients 18
Rheumatic factor

RA groupsero+

Number of patients 17
C-reactive protein

RA untreated group

Number of patients 35
C-reactive protein

RA groupsero-

Number of patients 18
C-reactive protein

RA groupsero+

Number of patients 17
Sedimentation

RA untreated group

Number of patients 35
Sedimentation

RA group sero-

Number of patients 18
Sedimentation

RA groupsero+

Number of patients 17
Asymmetric dimethyl arginine

RA untreated group

Number of patients 35
Asymmetric dimethyl arginine

RA group sero-

Number of patients 18
Asymmetric dimethyl arginine

RA groupsero+

Number of patients 17
Disease activity score ( DAS 28 )

RA unreated group

Number of patients 35
Disease activity score ( DAS 28 )

RA group sero-

Number of patients 18
Disease activity score ( DAS 28 )

RA groupsero+

Number of patients 17
Sensitivity % 48,57 0 100 66,66 16,66 76,47 77,14 72,22 82,35 74,28 77,77 70,58 80 72,22 88,23
Specificity % 94,28 94,28 94,28 88,57 88,57 88,57 88,57 88,57 88,57 100 100 100 100 100 100
Predictive values for positive test % 89,47 0 89,47 77,77 42,85 76,47 87,09 76,47 77,77 100 100 100 100 100 100
Predictive values for negative test % 35,29 35,29 0 40,38 36,60 11,42 20,51 13,88 8,82 20,45 10,25 12,5 16,16 12,5 5,40
Accuracy % 71,42 62,26 96,15 64,28 64,15 84,61 82,85 83,01 86,53 87,14 92,48 90,38 90 90,56 96,15