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Table 3 Comparison of occurrence of skin pain at different times between the two groups

From: Application of red light phototherapy in the treatment of radioactive dermatitis in patients with head and neck cancer

  Group E (n = 30) Group C (n = 30) χ 2 P
End of second week
 Mild 2 16 15.56 0.000
 Moderate 0 0
 Severe 0 0
End of third week
 Mild 7 26 24.31 0.000
 Moderate 0 0
 Severe 0 0
End of fourth week
 Mild 16 26 7.94 0.005
 Moderate 0 0
 Severe 0 0
End of fifth week
 Mild 27 30 3.61 0.076
 Moderate 0 0
 Severe 0 0
End of sixth week
 Mild 27 27 1.65 0.098
 Moderate 0 3
 Severe 0 0
χ 2 65.083 27.091   
P 0.000 0.000   
  1. Note: Group E is experimental group, and group C is control group