Sensitivity (%) (95% CI) | Specificity (%) (95% CI) | ||
Free DNA | Free DNA and COX-2 | ||
All cases | 83 (76 to 89) | 91 (86 to 96) | 92 (87 to 97) |
Sex | |||
Male | 80 (72 to 88) | 89 (82 to 94) | 88 (79 to 94) |
Female | 89 (76 to 96) | 97 (88 to 100) | 100 (–) |
Age (years) | |||
⩽60 | 89 (76 to 96) | 94 (84 to 99) | 87 (75 to 95) |
>60 | 80 (72 to 88) | 90 (83 to 95) | 96 (89 to 99) |
Smoking habits | |||
Non-smokers | 93 (81 to 99) | 97 (86 to 100) | 91 (79 to 98) |
Smokers | 80 (72 to 87) | 90 (83 to 95) | 93 (85 to 97) |
Histotype | |||
ADC | 83 (76 to 90) | 89 (84 to 94) | |
SCC | 83 (76 to 90) | 94 (90 to 98) | |
Others | 82 (75 to 89) | 91 (86 to 96) | |
Stage | |||
I | 88 (82 to 94) | 96 (93 to 99) | |
II | 73 (65 to 81) | 91 (86 to 96) | |
III | 80 (73 to 87) | 88 (82 to 94) | |
IV | 84 (78 to 90) | 87 (81 to 93) |
ADC, adenocarcinoma; SCC, squamous cell carcinoma.