Days of abstinence | Motile sperm concentration | <12×106 | Cut-off adopted (×106) to define a case (concentration of motile sperm) | ||
Mean | SD | n | % | ||
0–2 | 23.2 | 29.7 | 362 | 45.6 | <10.4 |
3 | 28.9 | 41.5 | 706 | 41.8 | <12.0 |
4 | 31.8 | 42.0 | 497 | 37.8 | <13.9 |
5 | 35.4 | 40.6 | 289 | 33.9 | <15.8 |
6 or more | 38.7 | 44.3 | 390 | 29.0 | <17.0 |
Overall | 31.2 | 40.6 | 2244* | 38.8 | – |
*Five subjects did not have days of abstinence recorded (see text).