extremely significantP <0.01
In the haplotype analysis, we found that the haplotypes with the frequency more than 1% in the rs9376267-rs9376268-rs1327475-rs7749390-rs1327474 block were extremely significant associated with the PTB risk ( P <0.01).
In the haplotype analysis, we found that the haplotypes with the frequency more than 1% in the rs9376267-rs9376268-rs1327475-rs7749390-rs1327474 block were extremely significant associated with the PTB risk ( P <0.01).