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Table 2 Ratings for each methodological quality criterion within and across journals

From: Risk of bias of randomized controlled trials published in orthopaedic journals

Methodological quality criteria Journal* Yes No Not reported
Proper Methods of Randomization AJSM 70.3% 9.5% 20.3%
JBJS 74.5% 6.6% 18.9%
JOR 57.1% 0.0% 42.9%
OC 58.3% 8.3% 33.3%
SJ 56.3% 0.0% 43.8%
Mean 63.3% 4.9% 31.8%
Concealment of Subject Allocation AJSM 66.2% 8.1% 25.7%
JBJS 75.5% 6.6% 17.9%
JOR 57.1% 0.0% 42.9%
OC 61.1% 5.6% 33.3%
SJ 56.3% 0.0% 43.8%
Mean 63.2% 4.1% 32.7%
Blinding of Participants AJSM 14.9% 18.9% 66.2%
JBJS 20.8% 23.6% 55.7%
JOR 14.3% 0.0% 85.7%
OC 30.6% 16.7% 52.8%
SJ 25.0% 37.5% 37.5%
Mean 21.1% 19.3% 59.6%
Blinding of Outcome Assessor AJSM 51.4% 14.9% 33.8%
JBJS 45.3% 21.7% 33.0%
JOR 57.1% 0.0% 42.9%
OC 61.1% 2.8% 36.1%
SJ 37.5% 18.8% 43.8%
Mean 50.5% 11.6% 37.9%
Outcome Measurements Performed in the Same Manner AJSM 91.9% 1.4% 6.8%
JBJS 95.3% 0.9% 3.8%
JOR 100.0% 0.0% 0.0%
OC 97.2% 0.0% 2.8%
SJ 87.5% 0.0% 12.5%
Mean 94.4% 0.5% 5.2%
Interventions Administration by Similarly Trained Individuals AJSM 79.7% 1.4% 18.9%
JBJS 48.1% 1.9% 50.0%
JOR 14.3% 0.0% 85.7%
Osteo 0.0% 0.0% 100.0%
SJ 12.5% 0.0% 87.5%
Mean 30.9% 0.7% 68.4%
Description of Compliance With the Intervention AJSM 77.0% 21.6% 1.4%
JBJS 64.2% 35.8% 0.0%
JOR 28.6% 71.4% 0.0%
OC 83.3% 16.7% 0.0%
SJ 56.3% 43.8% 0.0%
Mean 61.9% 37.9% 0.3%
Intention-To-Treat Analysis AJSM 39.2% 2.7% 58.1%
JBJS 39.6% 1.9% 58.5%
JOR 14.3% 0.0% 85.7%
Osteo 63.9% 0.0% 36.1%
SJ 50.0% 0.0% 50.0%
Mean 41.4% 0.9% 57.7%
Was Clustering Accounted for in the Analysis? AJSM 0.0% 0.0% 100.0%
JBJS 0.9% 0.0% 99.1%
JOR 0.0% 0.0% 100.0%
OC 0.0% 0.0% 100.0%
SJ 0.0% 0.0% 100.0%
Mean 0.2% 0.0% 99.8%
Were the Groups Similar at Baseline? AJSM 74.3% 4.1% 21.6%
  JBJS 71.7% 6.6% 21.7%
  JOR 42.9% 0.0% 57.1%
  OC 63.9% 25.0% 11.1%
  SJ 68.8% 6.3% 25.0%
  Mean 64.3% 8.4% 27.3%
  1. *AJSM American Journal of Sports Medicine, JBJS Journal of Bone and Joint Surgery, JOR Journal of Orthopaedic Research, OC Osteoarthritis and Cartilage, SJ Spine Journal.