Table 2. Association between stress categories and impaired semen quality parameters
Stress category	Total number of studies	Impaired semen quality parameters number of studies (%)					No associationnumber of studies (%)
		Volume	Total sperm count	Sperm concentration	Sperm progressive motility	Sperm abnormal morphology
Infertility-related stress	17	1 (5.9%)	3 (17.7%)	8 (47.1%)	10 (58.8%)	2 (11.8%)	6 (42.9%)
Academic stress	4	-	-	4 (100%)	4 (100%)	2 (50.0%)	-
Work-related stress	7	1 (14.3%)	2 (28.6%)	2 (28.6%)	3 (42.9%)	-	3 (42.9%)
Life events stress	5	1 (20.0%)	3 (60.0%)	3 (60.0%)	3 (60.0%)	1 (20.0%)	1 (20.0%)
Daily life stress	7	2 (28.6%)	4 (57.1%)	4 (57.1%)	2 (28.6%)	2 (28.6%)	3 (42.9%)