Involvement (#)

RF positivity (p value)

CCP positivity (p value)

No inflammation-relatable

radiologic alteration (48)

7 Chi square = 30.6717

(< 0.0001)

3 Chi square = 20.3910

(< 0.0001)

MCC/MTT (45)

32 Chi square = 11.249

(< 0.001)

21 Chi square = 0.153 (n.s.)

Subchondral erosion (57)

41 Chi square = 13.670

(< 0.001)

23 Chi square = 14.220

(< 0.0001)

Peripheral joint fusion (30)

20 Chi square = 4.350

(< 0.03)

12 Chi square = 1.029 (n.s.)

Arthritis mutilans (8)

6 Fisher exact = 0.124 (n.s.)

6 Fisher exact = 0.208 (n.s.)

Marginal erosions (22)

12 Chi square = 0.334 (n.s.)

8 Chi square = 1.9429 (n.s.)

Erosions only wrists (20)

16 Chi square = 141.5391

(< 0.00001)

9 Chi square = 72.4142

(< 0.00001)

Subchondral erosions + Fusion + MCC/MTT (9)

9 Fisher exact (< 0.00001)

7 Fisher exact (< 0.00001)

Fusion + MCC/MTT (7)

5 Fisher exact (< 0.00001)

3 Fisher exact (< 0.00001)

Subchondral erosions + Fusion

8 Chi square = 101.9613

(< 0.00001)

5 Chi square = 58.1568

(< 0.00001)