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Table 2 Sensitivity and specificity at different cut-off values of antibody responses against rSvSXP expressed as percent of a positive control (PP), using two sets of horses: A: all horses ( n =102); B: horses 7 months or older ( n =86)

From: SvSXP: a Strongylus vulgaris antigen with potential for prepatent diagnosis

Data set A B
PP cut-off Se$ Sp$ Se Sp
5 0.77 0.67 0.78 0.54
10 0.70 0.83 0.71 0.75
15 0.64 0.88 0.66 0.82
20 0.53 0.88 0.55 0.82
25 0.48 0.90 0.50 0.86
30 0.42 0.98 0.43 0.96
40 0.37 1 0.38 1
50 0.32 1 0.33 1
60 0.27 1 0.28 1
70 0.22 1 0.22 1
80 0.17 1 0.17 1
90 0.12 1 0.12 1
100 0.08 1 0.09 1
>100 0.05 1 0.02 1
AUC$ 0.820   0.783  
  1. $: Se: sensitivity; Sp: specificity; AUC: area under ROC curve.