|
Study
|
Selection
|
Comparability
|
Exposure
|
Quality score
|
|---|
|
Cases definition
|
Cases representativeness
|
Controls selection
|
Controls definition
|
Comparable for a, b, c*
|
Comparable for d, e, f*
|
Exposure ascertainment
|
Controls ascertainment
|
Non-response rate
|
|---|
|
Järvenpää J [5]
|
1
|
0
|
0
|
1
|
a, b, c
|
d, f
|
1
|
1
|
1
|
7
|
|
Rancourt MF [9]
|
1
|
0
|
0
|
1
|
a, b, c
|
f
|
1
|
1
|
1
|
7
|
|
Becker R [10]
|
1
|
0
|
0
|
1
|
a, b, c
|
f
|
1
|
1
|
1
|
7
|
|
Lunebourg A [11]
|
1
|
0
|
0
|
1
|
a, b, c
|
e
|
1
|
1
|
1
|
7
|
|
Cross MB [12]
|
1
|
0
|
0
|
1
|
a, b, c
|
NA
|
1
|
1
|
1
|
6
|
- NA data not available
- Comparability variables: a = age; b = sex; c = body mass index; d = operation time point; e = single surgeon; f = the same compartment
- *If all characteristics of a, b, and c were comparable, 1 point was assigned; if one, two, or three characteristics of d, e, and f were comparable, 1 point was assigned; otherwise, 0 points were assigned
