Table 2.

Correlation of anti-PM1-α and other known autoantibodies

	Number positive/all sera (% positive)	Number positive/PM1-α-positives (% positive)	Number positive/PM1-α-negatives (% positive)	P
Scl-70	0/28 (0)	0/15 (0)	0/13 (0)	*
Sm	0/28 (0)	0/15 (0)	0/13 (0)	*
Rib-P	1/28 (3.6)	1/15 (6.7)	0/13 (0)	*
RNP	4/28 (14.4)	1/15 (6.7)	3/13 (23.1)	*
Chromatin	1/28 (3.6)	1/15 (6.7)	0/13 (0%)	*
Ro-52	18/70 (25.7)	6/19 (31.6)	12/51 (23.5)	0.7056
Ro-60	6/70 (8.6)	2/19 (10.6)	4/51 (7.8)	0.9018
La	3/70 (4.3)	1/19 (5.3)	2/51 (3.9)	0.6766
Mi-2	10/70 (14.3)	3/19 (15.8)	7/51 (13.7)	0.8693
Jo-1	16/70 (22.9)	1/19 (5.2)	15/51 (29.4)	0.0688

* Not calculated due to the limited number of samples.