Prevalence of antibodies to Ro-52 in a serologically defined population of patients with systemic sclerosis

Table 1 Frequency and mean level of anti-Ro-52 in patients tested

Antibody Group	Number of patients	Anti-Ro-52 positive (%)	Mean anti-Ro52 level (U/ml)
ACA	197	28	22
AFA	48	15	18
ARA	207	25	22
ATA	210	19	22
fsnu	44	32	26
Anti-aats	6	100	109
Anti-Ku	5	60	49
NDA	173	28	31
Anti-Pm-Scl	49	33	34
Anti-U1-RNP	58	38	50
Anti-Ro-60	13	92	121
Total SSc	1010	27	28
Anti-aats (non-SSc)	55	64	78
Anti-Ku (non-SSc)	32	28	33