Summary of baseline characteristics of current and ex-smokers at the time of operation
| Ex-smokers | Current smokers | p-value | |
| Subjects | 36 | 14 | |
| Male | 31 (86) | 13 (93) | 0.663 |
| Age years | 65.5±9.7 | 51.9±8.1 | <0.0001 |
| BMI kg·m−2 | 26.0 (23.8–28.4) | 22.0 (18.2–24.7) | 0.002 |
| FEV1 % pred | 82.8±23.3 | 93.1±21.2 | 0.153 |
| FEV1/FVC % | 68.5 (61.9–75.4) | 63.6 (52.4–70.3) | 0.086 |
| Pack-years | 31.1 (17.7) | 49.6 (30.5) | 0.010 |
| Histological diagnosis | |||
| Adenocarcinoma | 28 (77.7) | 9 (64.3) | 0.473 |
| Squamous | 8 (22.3) | 5 (35.7) | |
| Tumour location | |||
| Lower oesophagus | 27 (75) | 9 (64.2) | 0.724 |
| Upper or mid oesophagus | 6 (16.7) | 3 (21.4) | |
| Unknown | 3 (8.3) | 2 (14.3) | |
| Cancer staging | |||
| IB, IIA or IIB | 15 (41.7) | 6 (42.9) | 0.939 |
| IIIA | 21 (58.3) | 8 (57.1) | |
| ASA grade | |||
| 2 | 26 (72.2) | 13 (92.9) | 0.148 |
| 3–4 | 10 (27.8) | 1 (7.1) | |
| mGPS=1 | 5 (14) | 3 (21) | 0.670 |
| Pre-operative NLR | 2.75 (2.07–3.15) | 2.61 (1.68–3.12) | 0.479 |
| Pre-operative PLR | 163.3 (130.7–207.3) | 160.3 (113.4–252.6) | 0.613 |
Data are presented as n, n (%), mean±sd or median (interquartile range), unless otherwise stated. BMI: body mass index; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; ASA: American Society of Anesthesiologists; mGPS: modified Glasgow Prognostic Score; NLR: neutrophil/lymphocyte ratio; PLR: platelet/lymphocyte ratio.