Table 6.
Cut-off values of kinematic sperm variables significantly related to litter size fertility, calculated from receiver operating characteristic (ROC) curves.
| Variable | Cut-Off Value | Sensitivity (%) | Specificity (%) | Area ROC | p-Value |
|---|---|---|---|---|---|
| Total Born per Litter | |||||
| VCL | 71.30 | 56.38 | 52.58 | 0.56 | 0.06 |
| ALH | 2.64 | 50.00 | 53.33 | 0.57 | 0.04 |
| BCF | 8.56 | 55.32 | 51.55 | 0.55 | 0.12 |
| Piglets Born Alive | |||||
| VCL | 71.50 | 53.19 | 55.67 | 0.56 | 0.06 |
| ALH | 2.64 | 53.57 | 50.47 | 0.58 | 0.03 |
| Number of Mummies | |||||
| VCL | 70.70 | 56.38 | 52.58 | 0.57 | 0.08 |
| VAP | 42.40 | 54.35 | 50.51 | 0.57 | 0.09 |
| ALH | 2.59 | 50.00 | 53.33 | 0.57 | 0.07 |
VCL: curvilinear velocity (µm·s−1); VAP: average path velocity (µm·s−1); ALH: amplitude of lateral head displacement (µm); BCF: beat-cross frequency (Hz).