| Table 2. Differences in parameter alterations based on the 1999 and 2010 WHO classifications. | |||||
| Alterations | WHO | Absolute Difference (%) | Relative Difference (%) | p | |
|---|---|---|---|---|---|
| 1999 n=477 (%) |
2010 n=477 (%) |
||||
| Total concentration | 163 (34.2) | 162 (34.0) | 0.2 | 0.6 | 1.000 |
| Concentration/ml | 170 (35.6) | 146 (30.6) | 5.0 | 14.0 | <0.001 |
| Motility a + b | 310 (65.0) | 151 (31.7) | 33.3 | 51.2 | <0.001 |
| Morphology | 335 (70.2) | 50 (10.5) | 59.7 | 85.0 | <0.001 |
| Vitality | 400 (87.9) | 175 (38.5) | 49.4 | 56.2 | <0.001 |
| With at least 1 abnormal parameter* | 401 (84.1) | 223 (46.8) | 37.3 | 44.4 | <0.001 |
| With at least 2 abnormal parameters* | 293 (61.4) | 112 (23.5) | 37.9 | 61.7 | <0.001 |
*The patient had alterations in any of the four parameters: total concentration, concentration/ml, motility and morphology. WHO: World Health Organization.