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Table 2 Diagnostic accuracy of different combinations of threshold values of these two biomarkers (n = 2349)

From: Diagnostic possibility of the combination of exhaled nitric oxide and blood eosinophil count for eosinophilic asthma

Categories Sensitivity (%) Specificity (%) PLR NLR PPV (%) NPV (%)
FeNO > 20 ppb       
 B-Eos > 100 cells/μl* 69.71 64.25 1.9 0.5 51.31 79.70
 B-Eos > 200 cells/μl* 56.07 81.10 3.0 0.5 61.58 77.36
 B-Eos > 300 cells/μl* 41.83 89.93 4.2 0.6 69.18 74.10
 B-Eos > 400 cells/μl* 31.89 93.22 4.7 0.7 71.77 71.70
 B-Eos > 500 cells/μl* 22.57 95.55 5.1 0.8 73.25 69.55
FeNO > 30 ppb       
 B-Eos > 100 cells/μl* 58.95 80.39 3.0 0.5 61.89 78.38
 B-Eos > 200 cells/μl* 47.42 89.63 4.6 0.6 71.19 75.93
 B-Eos > 300 cells/μl* 35.38 94.47 6.4 0.7 77.58 73.01
 B-Eos > 400 cells/μl* 26.97 96.28 7.3 0.8 79.67 70.93
 B-Eos > 500 cells/μl* 19.09 97.56 7.8 0.8 80.85 69.05
FeNO > 40 ppb       
 B-Eos > 100 cells/μl* 50.98 90.38 5.3 0.5 74.12 77.33
 B-Eos > 200 cells/μl* 41.00 94.92 8.1 0.6 81.33 74.86
 B-Eos > 300 cells/μl* 30.59 97.29 11.3 0.7 85.92 72.18
 B-Eos > 400 cells/μl* 23.32 98.18 12.8 0.8 87.36 70.32
 B-Eos > 500 cells/μl* 16.51 98.80 13.8 0.8 88.16 68.65
FeNO > 50 ppb       
 B-Eos > 100 cells/μl* 43.09 93.87 7.0 0.6 79.16 75.32
 B-Eos > 200 cells/μl* 34.66 96.76 10.7 0.7 85.25 73.27
 B-Eos > 300 cells/μl* 25.86 98.27 15.0 0.8 89.00 71.04
 B-Eos > 400 cells/μl* 19.72 98.84 17.0 0.8 90.16 69.50
 B-Eos > 500 cells/μl* 13.95 99.24 18.3 0.9 90.80 68.10
FeNO > 60 ppb       
 B-Eos > 100 cells/μl* 35.31 96.09 9.0 0.7 83.00 73.33
 B-Eos > 200 cells/μl* 28.40 97.93 13.7 0.7 88.13 71.68
 B-Eos > 300 cells/μl* 21.19 98.90 19.2 0.8 91.23 69.90
 B-Eos > 400 cells/μl* 16.16 99.26 21.8 0.8 92.17 68.66
 B-Eos > 500 cells/μl* 11.43 99.51 23.5 0.9 92.69 67.53
FeNO > 70 ppb       
 B-Eos > 100 cells/μl* 28.76 97.62 12.1 0.7 86.73 71.72
 B-Eos > 200 cells/μl* 23.13 98.74 18.4 0.8 90.86 70.39
 B-Eos > 300 cells/μl* 17.26 99.33 25.8 0.8 93.30 68.96
 B-Eos > 400 cells/μl* 13.16 99.55 29.2 0.9 94.04 67.96
 B-Eos > 500 cells/μl* 9.31 99.70 31.4 0.9 94.44 67.05
FeNO > 80 ppb       
 B-Eos > 100 cells/μl* 24.26 98.35 14.7 0.8 88.83 70.62
 B-Eos > 200 cells/μl* 19.51 99.13 22.4 0.8 92.37 69.51
 B-Eos > 300 cells/μl* 14.56 99.54 31.4 0.9 94.43 68.31
 B-Eos > 400 cells/μl* 11.10 99.69 35.5 0.9 95.05 67.48
 B-Eos > 500 cells/μl* 7.85 99.79 38.3 0.9 95.39 66.72
FeNO > 90 ppb       
 B-Eos > 100 cells/μl* 19.75 98.85 17.2 0.8 90.26 69.51
 B-Eos > 200 cells/μl* 15.89 99.39 26.1 0.8 93.38 68.62
 B-Eos > 300 cells/μl* 11.85 99.68 36.6 0.9 95.18 67.67
 B-Eos > 400 cells/μl* 9.04 99.78 41.4 0.9 95.72 67.00
 B-Eos > 500 cells/μl* 6.40 99.86 44.6 0.9 96.02 66.38
FeNO > 38 ppb       
 B-Eos > 203 cells/μl 42.18 94.41 7.6 0.6 80.31 75.14
  1. Baseline screening value of the former biomarker
  2. *Progressively increasing cutoff values of the combined biomarkers
  3. The optimal diagnostic cutoff value for each biomarker alone