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Table 2 Methodological quality assessment

From: Anterior knee pain in younger adults as a precursor to subsequent patellofemoral osteoarthritis: a systematic review

Quality criteria Utting et al 2005[18] Kannus et al 1999[19] Nimon et al 1998[20] Imhoff & Boni 1989[21] Hvid et al 1981[22] Dexel et al 1980[23] Karlson 1939[24]
Purpose clearly stated 1 1 1 0 1 0 0
Literature review relevant 1 1 1 1 1 0 1
Study design appropriate to study aims 1 0 1 1 1 1 1
No bias present 0 0 0 0 0 0 0
Sample described in detail 1 0 0 0 1 1 0
Sample size justified 0 0 0 0 0 0 0
Informed consent gained 0 0 0 0 0 0 0
Valid outcome measures used 0 0 0 0 1 0 0
Reliable outcome measures used 0 0 0 0 0 0 0
Results reported in terms of statistical significance 1 1 1 0 1 0 0
Analysis appropriate 1 1 1 1 1 1 1
Clinical importance of results reported 1 1 1 1 1 1 0
Appropriate conclusions 1 1 1 0 1 0 0
Clinical implications reported 0 1 1 1 1 1 0
Limitations of study acknowledged 1 1 0 0 1 0 0
Total 9 8 8 5 11 5 3
  1. 1, criterion fulfilled; 0, criterion not fulfilled.