Table 3. Performance of the Johnsen score, Copenhagen index, and testicular volume as predictors of sperm concentration, motility, and morphology.
| Parameter | Johnsen score (right/left) | Copenhagen index, digit II (right/left) |
Copenhagen index, digit III (right/left) |
Testicular volume (right/left) |
|---|---|---|---|---|
| Sperm concentration | >7.4/>8.2 | 0/0 | 0/0 | >12.8/0 |
| Sensitivity (%) | 37.5/50.0 | 0/0 | 0/0 | 75.0/0 |
| Specificity (%) | 91.6/91.6 | 0/0 | 0/0 | 90.0/0 |
| P value | 0.05/0.04* | 0/0 | 0/0 | 0.04*/0 |
| Total sperm motility | >8.2/>8.2 | <2.5/<2.5 | <2.5/0 | >12.0/0 |
| Sensitivity (%) | 55.5/44.4 | 55.5/66.6 | 33.3/0 | 55.0/0 |
| Specificity (%) | 90.9/90.9 | 81.8/81.8 | 92.3/0 | 90.0/0 |
| P value | 0.01*/0.02* | 0.04*/0.03* | 0.06/0 | 0.07/0 |
| Progressive motility | >9.1/>9.1 | <2.5/<2.5 | <1.5/0 | >13.6/0 |
| Sensitivity (%) | 76.9/76.9 | 46.1/53.8 | 73.3/0 | 66.6/0 |
| Specificity (%) | 71.4/71.7 | 85.7/85.7 | 66.6/0 | 85.7/0 |
| P value | 0.02*/0.03* | 0.07/0.06 | 0.03*/0 | 0.06/0 |
| Morphology | >7.9/>7.0 | 0/<4.0 | 0/0 | >13.6/>11.3 |
| Sensitivity (%) | 50.0/37.0 | 0/50.0 | 0/0 | 62.5/50.0 |
| Specificity (%) | 91.6/91.6 | 0/85.7 | 0/0 | 90.9/90.9 |
| P value | 0.03*/0.08 | 0/0.03* | 0/0 | 0.03*/0.06 |
*, statistically significant (P<0.05).