Table 1 Comparison of the matching factors of the unmatched and matched cohorts
Characteristics | Re-irradiation SABR group (N = 20) | Initial SABR group (unmatched cohort) (N = 316) | Initial SABR group (matched cohort) (N = 60) | ||||
|---|---|---|---|---|---|---|---|
Number | P-value* | SMD* | Number | P-value* | SMD* | ||
Age (> 75 years) | 9 (45.0%) | 135 (42.7%) | 1.000 | 0.046 | 24 (40.0%) | 0.896 | 0.101 |
Lung cancer primary | 15 (75.0%) | 222 (70.3%) | 0.842 | 0.107 | 48 (80.0%) | 0.875 | 0.120 |
Underlying pulmonary disease | 8 (40.0%) | 81 (25.6%) | 0.265 | 0.302 | 24 (40.0%) | 1.000 | < 0.001 |
Tumor size (> 2 cm) | 11 (55.0%) | 133 (42.1%) | 0.369 | 0.261 | 33 (55.0%) | 1.000 | < 0.001 |
Tumor location (lower lobe) | 9 (45.0%) | 142 (44.9%) | 1.000 | 0.001 | 27 (45.0%) | 1.000 | < 0.001 |