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Table 3 Classification outcomes using a 50% cut-off probability

From: Survival prediction in Amyotrophic lateral sclerosis based on MRI measures and clinical characteristics

A, Classification based on clinical characteristics alone
Training sample
 Predicted class Survival <18 months Survival >18 months Sensitivity 62.50%
 True Class Survival <18 months 15 7 Specificity 70.84%
 Survival >18 months 9 17 Accuracy 66.67%
Validation sample
 Predicted class Survival <18 months Survival >18 months Sensitivity 66.67%
 True Class Survival <18 months 4 1 Specificity 83.34%
 Survival >18 months 2 5 Accuracy 75.00%
B, Classification based on MRI measures alone
 Training sample
 Predicted class Survival <18 months Survival >18 months Sensitivity 79.16%
 True Class Survival <18 months 19 6 Specificity 75.00%
 Survival >18 months 5 18 Accuracy 77.08%
Validation sample
 Predicted class Survival <18 months Survival >18 months Sensitivity 66.70%
True Class Survival <18 months 4 3 Specificity 50.00%
 Survival >18 months 2 3 Accuracy 58.33%
C, Classification based on clinical and MRI measures
Training sample
 Predicted class Survival <18 months Survival >18 months Sensitivity 75.00%
 True Class Survival <18 months 18 4 Specificity 83.34%
 Survival >18 months 6 20 Accuracy 79.17%
Validation sample
 Predicted class Survival <18 months Survival >18 months Sensitivity 66.67%
True ClassSurvival <18 months 4 1 Specificity 83.34%
Survival >18 months 2 5 Accuracy 75.00%