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. 2013 Nov 25;60(4):145–155. doi: 10.1002/jmrs.28

Table 3.

Dosimetric data with significant differences between conformal and IMRT technique for anal canal cases.

Variable Conformal technique IMRT Test of normality Shapiro–Wilk t-Test Observed power β
Mean (SD) Mean (SD) Conformal technique IMRT
Normally distributed data
 PTV54
  CN 0.37 (0.03) 0.75 (0.03) 0.37 0.10 0.001 1.00
  HTCI 0.37 (0.02) 0.76 (0.02) 0.11 0.57 0.001 1.00
  Maximum 58.77 (0.90) 60.37 (0.96) 0.22 0.72 0.031 0.67
 Bladder
  Minimum 32.06 (7.39) 14.29 (3.68) 0.27 0.61 0.001 0.99
  Mean 46.01 (1.35) 33.53 (5.66) 0.93 0.16 0.001 0.99
  40 Gy 87.18 (11.13) 33.76 (16.20) 0.15 0.20 0.001 1.00
 Genitalia
  Maximum 55.38 (1.48) 45.00 (5.24) 0.58 0.33 0.001 0.95
  Mean 43.37 (0.76) 23.53 (3.66) 0.76 0.67 0.001 1.00
  Median 42.74 (0.92) 22.91 (4.31) 0.72 0.74 0.001 1.00
  40 Gy 80.37 (13.53) 0.29 (0.27) 0.54 0.17 0.001 1.00
 Left femoral head
  Minimum 25.58 (4.02) 9.30 (2.61) 0.13 0.32 0.001 1.00
  Mean 38.48 (3.99) 27.27 (4.06) 0.27 0.27 0.001 0.97
  Median 38.55 (6.24) 26.34 (3.82) 0.14 0.68 0.011 0.90
  30 Gy 84.13 (14.59) 33.96 (15.61) 0.58 0.24 0.001 1.00
  40 Gy 42.86 (18.67) 11.85 (9.02) 0.63 0.56 0.011 0.83
 Right femoral head
  Minimum 26.56 (4.06) 9.66 (2.17) 0.79 0.71 0.001 1.00
  Mean 39.40 (4.49) 27.46 (2.39) 0.35 0.99 0.001 1.00
  Median 38.66 (4.82) 26.78 (2.53) 0.25 0.85 0.001 0.99
  20 Gy 100.002 (–) 76.17 (9.51) – 0.70 0.001 1.00
  30 Gy 85.89 (15.91) 38.72 (7.70) 0.23 0.78 0.001 1.00
  40 Gy 44.07 (26.77) 10.95 (6.02) 0.88 0.66 0.031 0.66
Variable Conformal technique IMRT Test of normality Shapiro–Wilk Mann–Whitney test Observed power β
Median (SD) Median (SD) Conformal technique IMRT
Not normally distributed data
 PTV45
  CN 0.56 (0.12) 0.87 (0.09) 0.061 0.031 0.011 0.95
  HTCI 0.56 (0.12) 0.87 (0.10) 0.041 0.031 0.011 0.95
 Bladder
  Median 46.85 (0.85) 34.00 (6.87) 0.031 0.21 0.011 0.99
  30 Gy 100.00 (1.76) 60.49 (21.37) 0.001 0.33 0.011 0.96
 Genitalia
  20 Gy 99.86 (0.40) 68.04 (22.24) 0.011 0.93 0.011 0.88
  30 Gy 99.54 (1.87) 12.38 (14.53) 0.001 0.05 0.011 1.00
  50 Gy 6.00 (8.79) 0.00 (0.00) 0.031 0.001 0.011 0.54
 Left femoral head
  20 Gy 100.00 (0.07) 75.80 (17.60) 0.001 0.56 0.011 0.68

SD, standard deviation; CN, conformation number; HTCI, Healthy Tissue Conformity Index; PTV, planning target volume; Gy, Gray; PTV54, planning target volume receiving 54 Gy; PTV45, planning target volume receiving 45 Gy; IMRT, intensity modulated radiation therapy.

1

Statistically significant (<0.05).

2

All data points equal for this variable.