Table III.
Association of SPT/recurrence risk with each terminal node identified by the survival tree analysis
| Risk groups | Node | Event, N (%) | No event, N (%) | Adjusted HR (95% CI)a | P value | MST (months) |
| Low risk | Node 1 | 6 (13.64) | 38 (86.36) | Reference | >93 | |
| Node 2 | 3 (20.00) | 12 (80.00) | 1.63 (0.4–6.61) | 0.491 | >93 | |
| Node 3 | 4 (25.00) | 12 (75.00) | 2.33 (0.64–8.44) | 0.199 | >93 | |
| Node 4 | 39 (25.49) | 114 (74.51) | 1.87 (0.79–4.44) | 0.155 | >93 | |
| Medium risk | Node 5 | 8 (33.33) | 16 (66.67) | 2.96 (1.02–8.65) | 0.047 | >93 |
| Node 6 | 50 (37.31) | 84 (62.69) | 2.89 (1.22–6.84) | 0.016 | 79.4 | |
| High risk | Node 7 | 6 (75.00) | 2 (25.00) | 6.23 (1.96–19.81) | 0.0002 | 47.2 |
| Node 8 | 8 (66.67) | 4 (33.33) | 6.58 (2.19–19.81) | 0.0008 | 39.6 | |
| Node 9 | 10 (58.82) | 7 (41.18) | 7.18 (2.57–20.12) | 0.002 | 37.9 | |
| Node 10 | 7 (87.50) | 1 (12.50) | 17.2 (5.43–54.48) | 1.33 × 10−6 | 21.1 | |
| Node 11 | 6 (75.00) | 2 (25.00) | 11.4 (3.54–36.85) | 4.47 × 10−5 | 10.1 |
a
Adjusted by age, gender, ethnicity, smoking status, tumor site, stage and treatment.