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Table 1 Analysis of the index dip-test ability to distinguish respiratory infection shows 100% sensitivity (95% CI 81.4–100%), 72.22% specificity (95% CI 46.52–90.31%), 100% negative predictive value and 78.26% (95% CI 63.09–88.35%)

From: One-minute through test to distinguish lower respiratory infection by analysis of sputum; exploring the mechanisms

Index test

Present

n

Absent

n

Total

Respiratory infection

 Positive

True positive

a = 18

False positive

c = 5

a + c = 23

 Negative

False negative

b = 0

True negative

d = 13

b + d = 13

Total

 

18

 

18

36

  1. Diseases prevalence 50%