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Table 2 Qualitative parameters of 99mTc-PYP muscular uptake in patients with polymyositis or dermatomyositis and control persons

From: Quantitative 3D scintigraphy shows increased muscular uptake of pyrophosphate in idiopathic inflammatory myopathy

  Upper limbs   Lower limbs  
A. First observation
  All patients (N = 87) Controls (N = 48) p value All patients (N = 85) Controls (N = 47) p value
 Intensity score
  1 24 (28) 34 (71) < 0.0001 14 (16) 22 (47) < 0.0001
  2 34 (39) 10 (21) 50 (59) 24 (51)
  3 23 (26) 4 (8) 17 (20) 1 (2)
  4 6 (7) 0 (0) 4 (5) 0 (0)
 Patchy pattern
  Yes 21 (24) 3 (6) 0.01 19 (22) 3 (6) 0.03
  No 66 (76) 45 (94) 66 (78) 44 (94)
 Symmetry
  Yes 71 (82) 45 (94) 0.07 70 (82) 44 (94) 0.11
  No 16 (18) 3 (6) 15 (18) 3 (6)
B. Second observation
  All patients (N = 25) Controls (N = 25) p value All patients (N = 25) Controls (N = 25) p value
 Intensity score
  1 7 (28) 19 (76) < 0.0001 8 (32) 19 (76) < 0.0001
  2 3 (12) 3 (12) 5 (20) 6 (24)
  3 6 (24) 3 (12) 7 (28) 0 (0)
  4 9 (36) 0 (0) 5 (20) 0 (0)
 Patchy pattern
  Yes 0 (0) 1 (4) 1.00 0 (0) 0 (0) 1.00
  No 25 (100) 24 (96) 25 (100) 25 (100)
 Symmetry
  Yes 25 (100) 24 (96) 1.00 25 (100) 25 (100) 1.00
  No 0 (0) 1 (4) 0 (0) 0 (0)
  1. Number of observations (%)