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001) and between the unilateral tubal patency group and bilateral tubal nonpatent group (P=.012). However, the difference between the bilateral tubal patency and unilateral tubal patency groups was not significant (P=.266). The increase of the injecting pressure curve's slope for contrast agent during 4D HyCoSy is associated with the nonpatent degree of the tube. This condition can be used as an objective index of tubal patency and can be a reference in diagnosis and treatment. The increase of the injecting pressure curve's slope for c