Table 2 Definitions of 6 ‘SUM’ variables
From: Postoperative air leak grading is useful to predict prolonged air leak after pulmonary lobectomy
Postoperative period | P1 | P2 | P3 | P4 | P5 | P6 | P7 | P8 | P9 |
Air leak gradea | 0-4 (N1) | 0-4 (N2) | 0-4 (N3) | 0-4 (N4) | 0-4 (N5) | 0-4 (N6) | 0-4 (N7) | 0-4 (N8) | 0-4 (N9) |
Variable | Definition | ||||||||
SUM1to3 | N1 + N2 + N3 | ||||||||
SUM4to6 | N4 + N5 + N6 | ||||||||
SUM1to6 | N1 + N2 + N3 + N4 + N5 + N6 | ||||||||
SUM7to9 | N7 + N8 + N9 | ||||||||
SUM4to9 | N4 + N5 + N6 + N7 + N8 + N9 | ||||||||
SUM1to9 | N1 + N2 + N3 + N4 + N5 + N6 + N7 + N8 + N9 | ||||||||