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Table 3 Relation between Ach antibodies of the studied patients and QMG and QOL scores

From: Determinants of quality of life changes with plasmapheresis in patients with myasthenia gravis

  AchR antibodies Test value P value Sig.
Negative Positive
Initial QMG score Mean ± SD 22.31 ± 3.03 26.46 ± 3.73 −4.126a 0.000 HS
Range 18-27 19-34
QMG score after 1 month Mean ± SD 18.25 ± 2.41 18.00 ± 4.45 0.216a 0.829 NS
Range 15-22 11-30
QMG change Median (IQR) −14.86 (−24.08-−9.81) −32 (−42.31-−20.83) −3.518b 0.000 HS
Range −44.44-0 −58.06-0
Test value 4.676 9.936
P value 0.001 0.001
Initial QOL score Mean ± SD 43.25 ± 3.79 47.26 ± 4.79 −3.112a 0.003 HS
Range 37-48 36-57
QOL score after 1 month Mean ± SD 38.44 ± 5.27 38.34 ± 7.03 0.053a 0.958 NS
Range 30-48 25-54
QOL change Median (IQR) −11.66 (−17.79-−4.79) −16.33 (−29.27-−10.42) −2.218b 0.027 S
Range −25-4.44 −50-8.16
Test value 4.839 8.042
P value 0.001 0.001
  1. NS non-significant, S significant, HS highly significant, QOL quality of life, QMG quantitative myasthenia gravis, SD standard deviation, AchR acetylcholine receptors
  2. aIndependent t test
  3. bMann-Whitney test