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Table 3 Sensitivity, specificity, percentage of correctly classified patients and positive and negative likelihood ratio of basal cortisol at different cut off values

From: Effect of a 14-day course of systemic corticosteroids on the hypothalamic-pituitary-adrenal-axis in patients with acute exacerbation of chronic obstructive pulmonary disease

Cut-off value of basal cortisol Sensitivity Specificity Correctly classified LR+ LR-
<150 nmol/l 100% 50% 74% 2.0 0.0
<330 nmol/l 80% 86% 83% 5.6 0.2
>400 nmol/l 56% 96% 77% 15.7 0.5
  1. LR+ = positive likelihood ratio, LR- = negative likelihood ratio