Table 2 Genotype, carrier, and allele frequencies of IL4 −590, IL13 +2044, and IFNG +874 in 63 patients with primary Sjögren's syndrome and 63 healthy control subjects.

Genotype	pSS patients	Control subjects	p Value
IL4 −590 genotypes
CC	26 (41)	32 (51)
CT	31 (49)	26 (41)
TT	6 (10)	5 (8)	0.563
T allele carrier	37 (59)	31 (49)	0.284
Allele frequencies
Allele C	0.659	0.714
Allele T	0.341	0.286	0.342
IL13 +2044 genotypes (n = 59)
GG	24 (41)	28 (45)
AG	30 (51)	31 (49)
AA	5 (8)	4 (6)	0.859
A allele carrier	35 (59)	35 (56)	0.674
Allele frequencies
Allele A	0.339	0.310
Allele G	0.661	0.690	0.623
IFNG +874 genotypes
AA	27 (43)	23 (37)
AT	28 (44)	31 (49)
TT	8 (13)	9 (14)	0.767
T allele carrier	8 (13)	9 (14)	0.794
Allele frequencies
Allele A	0.651	0.611
Allele T	0.349	0.389	0.269

Statistical analysis by χ² test.

IFNG, interferon γ gene; IL, interleukin; pSS, primary Sjögren's syndrome.