Table 3.
Optimal cut‐offs for LAC, cTnI, and HR based on the maximal sum of sensitivity and specificity to predict early elimination of cows affected by downer cow syndrome
| Variables | Cut‐off value | Cows above selected cut‐off (%) | Se (%) | Sp (%) | P‐value |
|---|---|---|---|---|---|
| LAC (mmol/L) | >4 vs ≤4 | 17.6 | 18 | 92 | 0.4 |
| cTnI (ng/mL) | >0.7 vs ≤0.7 | 42.6 | 54 | 78 | <0.01a |
| HR (bpm) | >100 vs ≤100 | 27.7 | 35 | 85 | <0.01a |
LAC, l‐lactatemia; cTnI, cardiac troponin I; HR, heart rate (beats per minute); Se, sensitivity; Sp, specificity.
a
Variables retained for the multivariable logistic regression with P < 0.2.