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Table 2 Characteristics of episodes of incidental pain (n = 488) according to intensity (maximum VAS ≥ 7)

From: Prevalence and characteristics of breakthrough cancer pain in an outpatient clinic in a Catalan teaching hospital: incorporation of the Edmonton Classification System for Cancer pain into the diagnostic algorithm

  SAMPLE
(n = 488)
VAS MAX < 7
(n = 305)
VAS MAX ≥ 7
(n = 183)
p b
Due to Tumour 93,0 91,8 95,1 0,168
Due to treatment 8,0 8,5 7,1 0,575
Volitional 36,3 36,7 35,5 0,789
Non volitional 63,7 64,1 35,9 0,618
Neuropathic condition 50,0 45,4 63,0 0,001
∑NIPAC 2,2 ± 1 2,2 ± 1 2,3 ± 1 0,044
Type tumor     0,007
 Lung 31,6 35,4 25,1  
 Upper digestive 18,0 18,7 16,9  
 Lower digestive 20,1 20,3 19,7  
 ENT 7,6 6,9 8,7  
 Genitourinary male 8,4 8,9 7,7  
 Genitourinary female 5,1 4,3 6,7  
 Other 9,2 5,6 15,3  
  1. Values as percentage
  2. amean ± standard deviation
  3. bComparison between groups with the de χ2 test and for continuous variables with the Mann-Whitney test