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. 2014 Jan 9;15:10. doi: 10.1186/1471-2474-15-10

Table 1.

Criteria used to assess the methodological quality of selected cohort and cross-sectional studies

Item Criterion Study type
Study population
 
 
1
Selection before disease was present or at uniform point
CH/CC/CS
2
Cases and controls were drawn from the same population
CC
3
Participation rate ≥80% for cases/cohort
CH/CC/CS
4
Participation rate ≥80% for controls
CC
5
Sufficient description of baseline characteristics
CH/CC/CS
Assessment of risk factor
 
 
6
Psychosocial assessment was blinded
CH/CC/CS
7
Psychosocial factors were measured identical for cases and controls
CC
8
Psychosocial factors were assessed prior to the outcome
CH/CC/CS
Assessment of outcome
 
 
9
Knee OA/pain was assessed identical in studied population
CH/CC/CS
10
Presence of knee OA/pain was assessed reproducibly
CH/CC/CS
11
Presence of knee OA/pain was assessed according to standard definitions
CH/CC/CS
Study design
 
 
12
Prospective design was used
CH/CC/CS
13
Follow up time ≥2 years
CH
14
Withdrawals ≤20%
CH
Analysis and data presentation
 
 
15
Appropriate analysis techniques were used
CH/CC/CS
16 Adjusted for at least age and sex CH/CC/CS

CH, Applicable to cohort studies; CC, Applicable to case-control studies; CS, Applicable to cross-sectional studies; OA, Osteoarthritis.