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Table 1 Strength of Evidence grading used in these Guidelines.

From: 2011 SOSORT guidelines: Orthopaedic and Rehabilitation treatment of idiopathic scoliosis during growth

Strength of evidence Question Meaning
I Effectiveness Multiple Randomized Controlled Trials or Systematic Reviews of such studies
  Diagnosis Multiple Randomized Controlled Trials, or Cross-sectional Studies with verification by reference (gold) standard, or Systematic Reviews of such studies
II Effectiveness One Randomized Controlled Trial
  Diagnosis One Randomized Controlled Trial, or one Cross-sectional Study with verification by reference (gold) standard
III Effectiveness Multiple Controlled nonrandomized Studies or Systematic Reviews of such studies
  Diagnosis Multiple Cross-sectional Studies with incomplete & unbalanced verification with reference (gold) standard
IV Effectiveness Other studies
  Diagnosis  
V Effectiveness SOSORT Consensus with more than 90% of agreement
  Diagnosis  
VI Effectiveness SOSORT Consensus with 70 to 89% of agreement
  Diagnosis  
  1. Questions on Effectiveness (treatment results) and Diagnosis (assessment) have been considered