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Table 3 Study population cross classified by three variables (ethnicity, presence or absence of NEC and the study genotypes)

From: The prevalence of platelet activating factor acetylhydrolase single nucleotide polymorphisms in relationship to necrotizing enterocolitis in Northwest Louisiana infants

Ethnicity NEC Abnormal genotype Normal genotype Total
Caucasian Yes 1 19 20
Caucasian No 43 149 192
African-American Yes 7 9 16
African-American No 145 197 342
Total   196 374 570
  1. In view of small numbers, the homozygous abnormal genotype (genotype 1 in Table 2) and heterozygous abnormal genotype (genotype 2 in Table 2) were combined into one category (abnormal genotype).