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Table 3 Dosimetric and anthropometric characteristics* of clinical target volume and rib cage (n = 788)

From: No difference in dose distribution in organs at risk in postmastectomy radiotherapy with or without breast implant reconstruction

  Chest wall Chest wall plus lymph nodes
Characteristics IBR+ n = 59 IBR- n = 162 P-value¶ IBR+ n = 73 IBR- n = 73 P-value¶
CTV       
  Volume, cm3 629.4 [283.4] 458.4 [273.6] <0.001 1074.7 [263.0] 787.9 [289.0] <0.001
  Mean dose, Gy 50.2 [0.9] 50.7 [4.1] 0.31 50.4 [0.6] 50.4 [0.6] 0.97
  V95%, % a 91.2 [5.3] 91.4 [8.4] 0.83 93.7 [3.2] 93.3 [4.4] 0.43
  V95%, cm3b 572.2 [248.9] 417.0 [252.1] <0.001 1006.7 [251.6] 733.9 [270.0] <0.001
  V105%, % a 10.8 [8.2] 15.3 [12.1] 0.009 11.8 [6.6] 12.9 [6.1] 0.17
  V105%, cm3b 61.0 [37.9] 65.8 [56.6] 0.55 128.7 [79.6] 104.8 [68.6] 0.007
Rib cage       
  Transverse diameter, cm 23.5 [1.2] 23.5 [1.5] 0.70 24.2 [1.6] 23.4 [1.5] <0.001
  Anterioposterior diameter, cm 9.5 [1.5] 10.3 [1.5] <0.001 9.8 [1.3] 10.3 [1.5] 0.006
  Ipsilateral internal diameter, cm 14.2 [1.3] 15.5 [1.6] <0.001 14.6 [1.4] 15.3 [1.6] <0.001
  Chest wall index 2.5 [0.5] 2.3 [0.4] <0.001 2.5 [0.4] 2.3 [0.4] <0.001
  1. *All numbers in the rows indicate mean values [standard deviation].
  2. Radiotherapy plans of patients with temporary expanders containing magnetic ports (n = 30) were excluded from the analyses.
  3. CTV indicates clinical target volume; V95% and V105%, volume irradiated with 95% and 105% of isodose.
  4. aRelative volume assessment.
  5. bAbsolute volume assessment.
  6. ¶Student's independent t-test.
  7. †Measured at mammillary level tomography slide.