Non-RP mean RP  ≥ 3 mean Sig. (2-tailed) RP  ≥ 2 mean Sig. (2-tailed)
  n=94 n=5   n=11  
V5 (%) 50% 66% 0.171 64% 0.055
V10 (%) 34% 42% 0.415 44% 0.123
V15 (%) 21% 25% 0.593 27% 0.18
V20 (%) 14% 13% 0.815 17% 0.251
V25 (%) 10% 9% 0.768 12% 0.188
V30 (%) 7% 6% 0.602 9% 0.263
V35 (%) 5% 3% 0.279 6% 0.591
VS5 (cc’s) 1704 740 0.040* 1082 0.049*
VS10 (cc’s) 2232 1258 0.043* 1599 0.05*
VS15 (cc’s) 2642 1689 0.039* 2068 0.066
VS20 (cc’s) 2890 1949 0.041* 2350 0.084
VS25 (cc’s) 3019 2038 0.036* 2470 0.086
VS30 (cc’s) 3074 2103 0.05 2559 0.13
VS35 (cc’s) 3161 2165 0.038* 2631 0.108
MLD (Gy) 9.6 10.7 0.615 11.7 0.127
TCLV (cc’s) 3344 2254 0.031* 2798 0.117
Abbreviations: RP: Radiation pneumonitis; Vx: Percentage of lung receiving at least X Gy; VSx: Volume of lung spared X Gy; MLD: Mean Lung Dose; TLV: Total Lung Volume; CC’s: Cubic Centimeter; * p-value statistically significant at < 0.05
Table 5: Comparison of Means of Dosimetric Variables.