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Table 2 Genotype distribution and relative allele frequencies of -238 polymorphism of TNF-alph a gene in Chinese with URSA (n = 132) and controls (n = 152).

From: Association between -238 but not -308 polymorphism of Tumor necrosis factor alpha (TNF-alpha)v and unexplained recurrent spontaneous abortion (URSA) in Chinese population

Group No. Genotype frequency (%) Allele frequency (%)
   AA AG GG A G
URSA 132 0 (0) 4 (3.0) 128 (97.0) 4 (1.5) 260 (98.5)
Controls 152 0 (0) 17 (11.2) 135 (88.8) 17 (5.6) 287 (94.4)
   χ2 = 6.9, df = 2, P = 0.009 χ2 = 6.6, df = 1, P = 0.010