Table 3 Subgroup analysis of fluid accumulation on the basis of ultrasonography performed at 24 hours in the drain and no-drain groups with respect to type of surgery, size of gland and histological diagnosis
Mean fluid accumulation at 24 hours (ml) | ||||
|---|---|---|---|---|
Measurement parameter | Drain group | P -value | No-drain group | P -value |
Type of surgery | ||||
Lobectomy and isthmusectomy | 16.3 | 0.969 | 22.4 | 0.309 |
Total | 18.7 | 0.450 | 42.7 | 0.021 |
Completion | 12.2 | 0.271 | 8.9 | 0.026 |
Histological size | ||||
Below overall median size (36.5 cm3) | 16.2 | 19.5 | ||
Above overall median size (36.5 cm3) | 20.0 | 0.166 | 36.7 | 0.012 |
Histological diagnosis | ||||
Cancer | 17.9 | 0.560 | 20.2 | 0.483 |
Hypervascular disorders | 14.7 | 0.450 | 15.1 | 0.310 |
Other (benign) diagnoses | 15.9 | 0.751 | 18.0 | 0.900 |