Review Article
Smoking Exposure and Survival of Patients with Esophagus Cancer: A Systematic Review and Meta-Analysis
Table 4
Mortality and survival of EC patients for different studies.
| Smoking intensity
(pack year PY or cigarette/day C/D) | Author | Mean survival time (month) | Mortality rate | | HR | 95% CI |
| | PY < 20 |
Shitara et al. [12] | | 1 | — | | 20 ⩽ PY | 1.73 | (1.12–2.68) | | 20 ⩽ PY < 40 | 1.77 | (1.09–2.89) | | 40 ⩽ PY | 1.69 | (1.06–2.67) |
| | Never smoked |
Thrift et al. [16] | | 1 | — | | 0 < PY < 15 | 1.44 | (0.89–2.31) | | 15 ⩽ PY < 30 | 0.99 | (0.59–1.65) | | 30 ⩽ PY | 1.26 | (0.79–2.02) |
| | 20 ⩾ C/D |
Wu et al. [14] | 20.6 ± 27.0 | | | | C/D > 20 | 19.1 ± 25.6
| | |
|
|
PY: pack years; C/D: cigarettes per day.
|
