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Table 2 Cross-tabulation of the results of index test (COPD-6™) against the reference standard (spirometry) (N = 227)

From: Diagnostic accuracy of a pocket screening spirometer in diagnosing chronic obstructive pulmonary disease in general practice: a cross sectional validation study using tertiary care as a reference

Index test (COPD-6™) Reference standard (spirometry)  
Positive Negative Total
Positive
Negative
14
29
0
184
14
213
Total 43 184 227