Age at initial operation, years (mean±SD) | 65.8±8.9 | 64.4±9.0 | 0.328 |
Age at recurrence, years (mean±SD) | 67.2±9.2 | 65.4±9.1 | 0.239 |
Sex, n (%) | | | 0.051 |
Male | 88 (83.0) | 42 (70.0) | |
Female | 18 (17.0) | 18 (30.0) | |
Smoking index, pack-years (median (IQR)) | 25.0 (0.0−40.0) | 14.3 (0.0−35.0) | 0.180 |
Tumour location, n (%) | | | 0.003 |
Left lung | 39 (36.8) | 9 (15.0) | |
Right lung | 67 (63.2) | 51 (85.0) | |
Tumour size, cm (mean±SD) | 4.4±2.8 | 4.3±1.5 | 0.772 |
Histological type, n (%) | | | 0.005 |
Squamous cell carcinoma | 36 (33.9) | 10 (16.7) | |
Adenocarcinoma | 58 (54.7) | 37 (61.6) | |
Bronchioloalveolar carcinoma | 6 (5.7) | 1 (1.7) | |
Large cell carcinoma | 6 (5.7) | 9 (15.0) | |
Adenosquamous carcinoma | 0 (0.0) | 3 (5.0) | |
Extent of pulmonary resection, n (%) | | | 0.158 |
Sublobar resection | 1 (0.9) | 1 (1.7) | |
Lobectomy | 87 (82.1) | 45 (75.0) | |
Bilobectomy or pneumonectomy | 18 (17.0) | 14 (23.3) | |
T status, n (%) | | | 0.095 |
T1 | 34 (32.1) | 12 (20.0) | |
T2 | 72 (67.9) | 48 (80.0) | |
Visceral pleural invasion, n (%) | | | 0.016 |
Absent | 88 (83.0) | 39 (65.0) | |
Present | 16 (15.1) | 18 (30.0) | |
Unknown | 2 (1.9) | 3 (5.0) | |
Disease-free interval, months (median (IQR)) | 12.6 (6.1−21.9) | 10.6 (5.2−16.4) | 0.118 |