

Table 2: Allelic frequencies of RETN rs1862513 SNP in PTB patients
and healthy controls. ^{a}The data are expressed as absolute numbers and percentages in parenthesis. ^{b}The sum of the absolute numbers of the two alleles of each SNP is twice the number of patients and controls. cThe study has 99 % power for detecting an odds ratio (OR) ≥ 2. 