Table 3. Univariable and multivariable analyses for total drainage volume.
| Variable | Beta value [95% CI] | P value |
|---|---|---|
| Univariable analysis | ||
| Suction (yes vs. no) | −117.311 [−213.442, −21.18] | 0.02 |
| Age, years | 7.748 [3.818, 11.677] | <0.001 |
| Sex (female vs. male) | −93.715 [−201.307, 13.877] | 0.09 |
| BMI, kg/m2 | 3.792 [−13.488, 21.073] | 0.67 |
| Smoking status (current/ever vs. never) | 63.587 [−88.065, 215.238] | 0.41 |
| ASA (3 vs. 2) | 68.068 [−100.098, 236.235] | 0.43 |
| Morbidity (yes vs. no) | 82.247 [−17.592, 182.085] | 0.11 |
| FEV1% | −2.616 [−5.689, 0.457] | 0.10 |
| DLCO% | 0.575 [−3.095, 4.244] | 0.76 |
| Pleural adhesion (yes vs. no) | 105.438 [−7.311, 218.187] | 0.07 |
| Well-developed intralobular fissure (yes vs. no) | −133.24 [−629.927, 363.447] | 0.60 |
| Lymph (dissection vs. sampling) | −120.608 [−346.77, 105.554] | 0.30 |
| Number of lymph node | 53.064 [20.338, 85.79] | 0.002 |
| Number of lymph node dissection stations | 53.881 [22.732, 85.03] | 0.001 |
| Extent (seg vs. lob) | −173.726 [−270.185, −77.268] | 0.001 |
| Surgery duration, min | 2.51 [0.425, 4.596] | 0.02 |
| Multivariable analysis | ||
| Suction (yes vs. no) | −137.651 [−232.773, −42.528] | 0.005 |
| Surgery duration, min | 1.865 [−0.189, 3.919] | 0.08 |
| Extent (seg vs. lob) | −115.638 [−221.023, −10.253] | 0.03 |
| Number of lymph node | 118.752 [−359.023, 596.527] | 0.63 |
| Number of lymph node dissection stations | −77.807 [−556.619, 401.006] | 0.75 |
CI, confidence interval; BMI, body mass index; ASA, the American Society of Anaesthesiologists; FEV1%, predicted forced expiratory volume in one second; DLCO%, predicted diffusion capacity of carbon oxide.