In addition to MBzP (p = 0.052), the concentrations of the remaining 9 phthalate metabolites, including DMP (p < 0.001), MMP (p = 0.001), DEP (p = 0.003), MEP (p = 0.002), DBP (p = 0.041), MBP (p < 0.001), BBzP (p = 0.009), DEHP (p < 0.001) and MEHP (p < 0.001), were all significantly higher in the endometriosis group than in the control group. Here, MBP is linked to endometriosis.