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. 2018 Apr 24;19:633–639. doi: 10.1016/j.nicl.2018.04.028

Table 1.

Contingency table of observed conversion latencies and cerebellar FA-based conversion predictions. The critical FA threshold of FAcrit = 0.352 is the cerebellar mean FA of patients with early RRMS as determined in our previous study (Deppe et al., 2016b). Sensitivity = TP / (TP + FN) = 10/12 = 0.83, Specificity = TN / (TN + FP) = 4/4 = 1.00, χ2 = 8.89, p = 0.0029 (TP = true positive, FN = false negative, FP = false positive, TN = true negative).

Observation test Early conversion (≤24 months) Late conversion (>24 months)
FA ≤ FAcrit (test positive) 10 (TP) 0 (FP) Positive: 10
FA > FAcrit (test negative) 2 (FN) 4 (TN) Negative: 6
12 4 16