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Table 3 Summary of study quality assessment

From: Physical Activity Following Hip Arthroscopy in Young and Middle-Aged Adults: A Systematic Review

   Internal Validity
 External ValidityPerformanceDetectionAttritionSelection bias/control of confounding
StudyRepresentative
1Participation rate
Direct observation
PROM-validity/reliability
2Direct measure - validity/ reliabilityBlinded assessors
3Outcome measure
1Completeness
4Age
Location
5Sex
6Severity of Joint disease
7Follow-up
Single site &/or surgeon(YES)LOE
RCTs
n=22222NA2201202112
Prospective studies, more than 1 arm
n=1310131391113113128101123
Prospective studies, Single-arm
n=1156107NA111821137193/4
Retrospective studies, more than1 arm
n=534148532NA1494335237442514
Retrospective studies, Single-arm
n=413240406NA140353407350384
  1. RCTs randomised controlled trials, LOE level of evidence (Oxford Centre for Evidence-Based Medicine [31]), PROM patient-reported outcome measure.
  2. indicates the measure was adequately addressed in the study
  3. 1 percent participation/ completion was 80% or more.
  4. 2NA indicates no direct measure of PA used
  5. 3 indicates same method of ascertainment was used for all participants
  6. 4 if range within 18–50
  7. 5 if sex is balanced (10% or less difference) or adjusted for in analysis
  8. 6 if severity of OA identified in the study
  9. 7 where FU is the same for all study participants or lies within 10%, i.e. the following acceptable ranges: 1 year follow-up = 1 month each way; 2 years follow-up = 2 months; 3 years follow-up = 3 months……10 years = 10 months
  10. LOE=Level of evidence (Oxford Centre for Evidence-Based Medicine [31]); PROM=patient-reported outcome measure