Table 1:
Patient characteristics
| Characteristics | No. (%)/median (IQR) |
|---|---|
| Age at surgery, years | 62 (53.00–67.00) |
| Gender | |
| Male | 134(48.70) |
| Female | 141(51.30) |
| BMI (kg/m2) | 24.11(21.78-25.95) |
| Smoker | 88(32.00) |
| Hypertension | 107(38.9) |
| Diabetes mellitus | 38(13.8) |
| Coronary artery disease | 21(7.6) |
| Cerebrovascular disease | 18(6.5) |
| Laterality | |
| Right upper lobe | 95(34.5) |
| Right middle lobe | 28(10.2) |
| Right lower lobe | 55(20.0) |
| Left upper lobe | 49(17.8) |
| Left lower lobe | 48(17.5) |
| Clinical stage | |
| IA1 | 19(6.9) |
| IA2 | 96(34.9) |
| IA3 | 70(25.5) |
| IB | 41(14.9) |
| IIA | 14(5.1) |
| IIB | 9(3.3) |
| IIIA | 19(6.9) |
| IIIB | 3(1.1) |
| Clinical T stage | |
| T1a | 18(6.5) |
| T1b | 96(34.9) |
| T1c | 77(28.0) |
| T2a | 54(19.6) |
| T2b | 16(5.8) |
| T3 | 11(0.0) |
| T4 | 1(0.4) |
| Clinical N stage | |
| N0 | 245(89.1) |
| N1 | 8(2.9) |
| N2 | 18(6.5) |
| Bleeding volume | 30(20-50) |
| Immediate postoperative air-leakage | 128(46.5) |
| Surgery duration, min | 109.70(90.25-137.96) |
| SumPBP | 1016.24 (704.98-1787.41) |
| SumPBP-Flushing | 73.92(39.51-141.61) |
| Drainage volume (ml) | 410(275-750) |
| Prolonged tube indwelling duration | 38(13.8) |
| Histological subtype | |
| Adenocarcinoma | 224(81.5) |
| Squamous | 23(8.4) |
| Large cell, mixed, other | 28(10.2) |
N = 275.
BMI: body mass index; IQR: interquartile range; PBP: proportion of blood pixels; SumPBP: sum of PBP; SumPBP-Flushing: sum of PBP from flushing to the end of the operation.