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Table 1 Newcastle–Ottawa scale

From: A meta-analysis of unicompartmental knee arthroplasty revised to total knee arthroplasty versus primary total knee arthroplasty

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
  1. NA data not available
  2. Comparability variables: a = age; b = sex; c = body mass index; d = operation time point; e = single surgeon; f = the same compartment
  3. *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