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Patients’ characteristics
| All (n = 68) | Non-pneumonitis (n = 16) | Pneumonitis (n = 52) | p value | |
| Age (years) | 78.1 ± 8.0 | 77.5 ± 6.2 | 78.2 ± 8.5 | 0.47 |
| T1 : T2 | 49 : 19 | 13 : 3 | 36 : 16 | 0.53 |
| Male : female | 45 : 23 | 10 : 6 | 35 : 17 | 0.77 |
| Surgery + : – | 37 : 31 | 9 : 7 | 28 : 24 | 1.00 |
| Upper and middle/lingual : lower | 30 : 38 | 7 : 9 | 23 : 29 | 1.00 |
