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Table 2. SPMI/Sg concentrations (mg/mL) in different sperm concentrations or sperm motility groups in healthy male volunteers^*

Group	Mean (SD)	Median (range)

Sperm concentration $>=$ 20 x 10⁶ (n = 84)	18.6 (12.0)	15.7 (4.2-67.9)
Sperm concentration <20 x 10⁶ (n = 16)	20.2 (15.7)	14.6 (3.6-55.3)
Sperm motility $>=$ 50% (n = 69)	17.5 (10.8)	15.0 (3.6-59.2)
Sperm motility <50% (n = 31)	21.8 (15.5)	14.9 (5.2-67.9)

*SPMI indicates seminal plasma motility inhibitor; Sg, semenogelin.