Allele PTB patients (n=192) Controls (n=245) p OR 95% CI -420 C 273 (71.09)a,b 330 (67.35) 0.26c 1.19 0.89-1.59 -420 G 111 (28.91) 160 (32.65)

Table 2: Allelic frequencies of RETN rs1862513 SNP in PTB patients and healthy controls. aThe data are expressed as absolute numbers and percentages in parenthesis. bThe 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.