Association of Upon-Diagnosis Blood Eosinophilic Count with Frequency and Severity of Annual Exacerbation in Chronic Obstructive Pulmonary Disease: A Prospective Longitudinal Analysis

Table 3

Diagnostic accuracy of eosinophilic count for incident COPD in newly diagnosed patients by 100 intervals (cell/microliter).

Cutoff	Sensitivity	Specificity	Youden index
100	98.6	21.9	0.226
200	97.5	33.8	0.274
300	97.2	42.4	0.295
400	97.0	49.9	0.348
500	88.8	56.7	0.423
600	85.2	63.6	0.517
700	83.9	70.4	0.526
800	80.2	76.6	0.596
900	77.6	82.3	0.546
1,000	75.2	87.8	0.523
1,100	71.0	92.6	0.501
1,200	70.3	95.3	0.485
1,300	68.4	96.5	0.425
1,400	69.5	96.9	0.412
1,500	66.7	97.1	0.406

COPD = chronic obstructive pulmonary disease.