Serum interleukin-6 level and its association with pulmonary involvement in progressive systemic sclerosis; a case-control study

Table 3 The frequencies of the involved organs by PSS, concurrent other rheumatologic diseases and qualitative CRP in both groups of the study

Variable	Case group (N = 30)	Control group (N = 30)	P-value
Skin involvement	30 (100%)	30 (100%)	1^a
Cardiac involvement	8 (26.6%)	0 (0%)	0.003^a
Heart failure	1 (12.5%)	0 (0%)
Pericarditis	7 (87.5%)	0 (0%)
Other rheumatologic diseases	5 (16.7%)	6 (20%)	0.739^a
Osteoporosis	5 (100%)	2 (33.3%)
Rheumatoid arthritis	0 (0%)	2 (33.3%)
Polymyositis	0 (0%)	1 (16.7%)
Sjögren disease	0 (0%)	1 (16.7%)
Qualitative CRP
Negative	8 (26.7%)	17 (56.7%)	0.010^a
+ 1	9 (30%)	7 (23.3%)
+ 2	7 (23.3%)	5 (16.7%)
+ 3	6 (20%)	1 (3.3%)

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