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Table 4 Operating characteristics for prediction of prolonged mechanical ventilation (n = 40)

From: A simple functional marker to predict the need for prolonged mechanical ventilation in patients with Guillain-Barré syndrome

Predictive factor Sensitivity Specificity PPV NPV Youden index Odds ratio (95% CI) P value
Lack of foot flexion ability at admission 0.73 0.66 0.82 0.53 0.40 5.4 (1.2-23.6) <0.02
Lack of foot flexion ability at end of immune therapy 0.82 0.58 0.81 0.58 0.40 6.4 (1.4-28.8) <0.01
Presence of a motor conduction block 0.72 0.71 0.85 0.53 0.45 6.8 (1.4-33.5) <0.05
Presence of a motor conduction block and lack of foot flexion ability at end of immune therapy 0.56 1 1 0.39 0.56   <0.001
  1. CI, confidence interval; NPV, negative predictive value; PPV, positive predictive value.