Urinary cotinine concentrations in healthy controls (HC), COPD patients and asthma patients
| First author [ref.] | Patients | Smokers versus nonsmokers | SHS | |||||
| Cut-off | Sns | Spc | Cut-off | Sns | Spc | |||
| HC | Goniewicz [10] | 601 | 31.5 ng·mL−1 | 97.1% | 93.9% | See table 4 | NA | NA |
| Kim [11] | 11 629 | 164 ng·mL−1 | 93.2% | 95.7% | NA | NA | NA | |
| COPD | Chen [6] | 78 | NA | NA | NA | NA | NA | NA |
| Asthma | Fernandes [9] | 996 | 196.98 μg·g−1 | NA | NA | NA | NA | NA |
The cut-off showed for asthmatic patients is normalised on serum creatinine, expressed in grams. Sns: sensitivity; Spc: specificity; SHS: second-hand smoke; NA: not available.