After calculating the percent sensitivity, specificity,
accuracy, predictive values and likelihood ratios for all the
significantly altered parameters, ALP followed by Zn was
most in agreement with IDF criteria for SCM considered
irrespective of the causative agents (Tables 4 and 5). The
likelihood ratios for ALP and Zn were 16.54 and 12.52
respectively. In the case of Fe, Co and LDH apart from
percent specificity and negative predictive value all the
other values were found to be too low to be useful in
predicting SCM caused by Gram negative bacteria (Table 4),
but there values were satisfactory and acceptable when we
measured them in SCM milk infected by Gram positive
bacteria only (Table 5). When both ALP and Zn was considered together to diagnose SCM, the values were
greater than 99% for all kinds of infections. The likelihood
ration was also very high (Table 4).