Table 1.

Characteristics of infertility factors

	n.(%)
Male factor	33,100(31.4)
Tubal factor	19,532 (18.5)
Endometriosis	8,690(8.2)
Antisperm antibody	770(0.7 %)
Others	15,871(15.1 %)
Unknown	43,765(41.5)

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