TABLE 1.

Subcategorization of unexplained infertility and description of the four cohorts

Unexplained infertility cohorts	Description	Criteria	Total 721 n(%)
UI (1)	Non‐tuboperitoneal Non‐sperm factor UI	TMSC≧20million	103
		On laparoscopy:
		No endometriosis
		No pelvic adhesions
		No tubal anatomical defect
		B/L tubal patency
UI (2)	Mild Tuboperitoneal or Mild‐sperm‐factor UI	Total	86
		Total motile sperm count < 20 million	22
		Unilateral Tubal block	17
		Previous ectopic with bilateral tubal patency	2
		Fimbrial phimosis on laparoscopy	12
		Peritubal adhesions altering tubo‐ovarian relationship on laparoscopy	12
		Minimal to mild endometriosis on laparoscopy defined as per AFS 1985 criteria	11
		Combinations and others	10
UI (3)	Indeterminate	Laparoscopy not done	114
		Tubal patency on HSG
		TMC≧20 million
Controls	B/L tubal block/Severe male/severe endometriosis	Total	418