Table 1 Motile sperm concentration by days of abstinence, with cut-off for case definition
Days of abstinenceMotile sperm concentration<12×106Cut-off adopted (×106) to define a case (concentration of motile sperm)
MeanSDn%
0–223.229.736245.6<10.4
328.941.570641.8<12.0
431.842.049737.8<13.9
535.440.628933.9<15.8
6 or more38.744.339029.0<17.0
Overall31.240.62244*38.8
  • *Five subjects did not have days of abstinence recorded (see text).