Table 2.
The postoperative outcomes in the unmatched and matched cohorts.
| Outcomes | Unmatched | Matched | ||||
|---|---|---|---|---|---|---|
| Nonsuction (371) | Suction (102) | p-value | Nonsuction (173) | Suction (96) | p-value | |
| Chest tube duration (day) | ||||||
| Median (IQR) | 2 (2–4) | 3 (2–4) | 0.032 | 2 (2–3)a | 3 (2–4) | 0.003 |
| Mean (SD) | 2.99 (2.03) | 3.51 (2.64) | 2.80 (1.78) | 3.63 (2.68) | ||
| Drainage volume in first 3 postoperative days (ml) | 511.09 (401.68) | 388.21 (301.57) | 0.004 | 504.78 (387.90) | 386.90 (301.00) | 0.011 |
| Total drainage volume (ml) | 786.38 (1169.10) | 596.21 (739.05) | 0.122 | 717.89 (849.13) | 605.92 (755.57) | 0.286 |
| Postoperative length of hospital stays (days) | 4 (3–6) | 4 (3–6) | 0.747 | 4 (3–5) | 4 (3–6) | 0.170 |
| Total cost (¥) | 48,773.54 (12,575.12) | 48,413.08 (8,962.41) | 0.787 | 48,974.10 (10,497.39) | 48,736.85 (9,121.13) | 0.853 |
| Complications | ||||||
| Pulmonary infection (%) | 8 (2.2) | 0 (0.0) | 0.288 | 2 (1.2) | 0 (0.0) | 0.751 |
| PAL (%) | 10 (2.7) | 9 (8.8) | 0.012 | 2 (1.2) | 9 (9.4) | 0.003 |
| Persistent drainage (%) | 36 (9.8) | 16 (15.8) | 0.126 | 10 (5.8) | 16 (16.8) | 0.007 |
a
Results are presented as mean (standard deviation), median (IQR), or counts (proportions). PAL, persistent air leak.