Selective IgA Deficiency in Autoimmune Diseases

Table 6 Prevalence of IgA deficiency among JRA and RA patients.

Year	Reference	Country	Age (years)	Sample size	IgAD (prevalence)	Criteria (g/L)
1970	229	USA	2.5–25	200	2 (1:100)	Undetectable
1972	230	USA	Children	176	3 (1:59)	0.2
1973	231	Finland	2–16	115	5 (1:23)	Undetectable
1973	232	USA	1–21	200	8 (1:25)	0.005
1977	233	USA	Children	324	14 (1:23)	0.01
1979	234	UK	Children	582	12 (1:49)	0.1
1983	235	Finland	Children	350	10 (1:35)	0.02
2011	236	Iran	Children	83	1 (1:83)	NM
Total for JRA				2,030	55 (1:37)
1969	53	USA	NM	61	1 (1:61)	Undetectable
1971	237	Norway	NM	3187	8 (1:398)	Undetectable
1985	57	Turkey	NM	25	1 (1:25)	NM
1997	238	India	1–70	69	1 (1:69)	Undetectable
2003	239	UK	18–75	352	8 (1:44)	<50 IU/mL
Total for RA				3,694	19 (1:194)
Total				5,724	74 (1:77)

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