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Box plot of clinical variables, BPI short 6pp (a) and pain unpleasantness max (b and c), by genotype of rs4633, rs11135349, and rs7548151, respectively, in perinatal women. Tukey’s multiple comparisons post hoc test was performed on the clinical variables between each genotype group per SNP. *P ≤ 0.05, **0.005< P <0.01, and ***P < 0.0005.
