Table 2.
Case-mix variables in arthroplasty registriesa
| Category Case-mix variable | Level of datab | Registries that directly record the variablec | Registries that obtain variable the via linkaged | References |
|---|---|---|---|---|
| Demographic | ||||
| Age | 1 | All | Jones et al. 2001, Franklin et al. 2008, Rolfson et al. 2011a, Judge et al. 2012b, Williams et al. 2013, Gordon et al. 2014a, SooHoo et al. 2015. | |
| Sex | 1 | All | Rolfson et al. 2011a, Judge et al. 2012b. | |
| Dependency/marital status | 2 | FORCE-TJR, NJR | SHAR, SKAR | Judge et al. 2012, NHS England Analytical Team 2013, Greene et al. 2014a. |
| Work status | 2 | FORCE-TJR | Judge et al. 2010. | |
| Socioeconomic status | ||||
| Education | 2 | ACORN, FORCE-TJR, GAR, HSS, MARCQI | DHR, DKR, NAR, SHAR, SKAR | OECD 1999, UNESCO 2006, Judge et al. 2010, Greene et al. 2014a. |
| Deprivation index | 2 | RACat | NJR | Judge et al. 2012, Neuberger et al. 2012, 2013, NHS England Analytical Team 2013. |
| Joint-specific history | ||||
| Diagnosis | 1 | All | Judge et al. 2012. | |
| Previous surgery | 2 | ACORN, BAR, CJRR-Calif, DKR, FAR, FORCE-TJR, GAR, LROI, NAR, NJR, RIAP, RIPO, SKAR | NHS England Analytical Team 2013. | |
| Body habitus | ||||
| Height and weight (BMI) | 2 | ACORN, AJRR, AOANJRR, CJRR-Calif, CJRR-Canada, DKR, FORCE-TJR, GAR, HJR, HJRR, HSS, KP-TJRR, LROI, MARCQI, NJR, RACat, RIPO, SIRIS, SHAR, SKAR | Lübbeke et al. 2007, Franklin et al. 2008, Jameson et al. 2014b, Judge et al. 2014. | |
| Lifestyle factors | ||||
| Smoking | 3 | AJRR, FORCE-TJR, GAR, LROI, MARCQI, SHAR | ||
| Level of activity | 3 | CJRR-Calif, GAR, HJR, HSS | ||
| Alcohol abuse | 3 | GAR, HJR, MARCQI | Jenkins et al. 2011. | |
| Comorbidities | ||||
| Charlson Comorbidity Index | 2 | DHR, FORCE-TJR, HJRR, HSS | NAR, NJR, SHAR, SKAR | Bjorgul et al. 2010, NHS England Analytical Team 2013, Greene et al. 2015. |
| Elixhauser Comorbidity Index | 2 | KP-TJRR, RACat | NAR, MARCQI, SHAR, SKAR | Greene et al. 2015. |
| ASA class | 2 | ACORN, AJRR, AOANJRR, CJRR-Calif, GAR, HJRR, HSS, KP-TJRR, LROI, MARCQI, NAR, NJR, NZJRR, SHAR, SIRIS, SKAR | Bjorgul et al. 2010, Hooper et al. 2012, Judge et al. 2012, SooHoo et al. 2015. | |
| Charnley class | 2 | DHR, FORCE-TJR, GAR, HJR, LROI, NAR, RIPO, SIRIS, SHAR, SKAR | Dunbar et al. 2004, Bjorgul et al. 2010, Rolfson et al. 2011a. | |
| Back pain | 2 | FORCE-TJR | Ayers et al. 2013. | |
| Mental health/depression | 2 | GAR, FORCE-TJR, HJR | Franklin et al. 2008, Rolfson et al. 2009, Judge et al. 2012. | |
| Preoperative PROMs | ||||
| Pain, function, and/or HRQoL | 3 | ACORN, AJRR, CJRR-Calif, FORCE-TJR, GAR, HJR, HSS, INOR, LAR, LROI, MARCQI, RIAP, SHAR, SKAR | NJR (through NHS) | Franklin et al. 2008, Rolfson et al. 2009, Judge et al. 2011, 2012, Greene et al. 2015, Maratt et al. 2015, SooHoo et al. 2015. |
Case-mix variable is a variable that is predictive of improvement in an outcome measure. Abbreviations: ASA, American Society of Anesthesiologists Physical Status Classification; BMI, body mass index; NHS, National Health Service England; HRQoL, health-related quality of life; PROMs, patient-reported outcome measures.
Register level of data (Rolfson et al. 2011b). [Authors: not very clear/language editor]
Registries: ACORN, Arthroplasty Clinical Outcomes Registry National Australia; AJRR, American Joint Replacement Registry; AOANJRR, Australian Orthopaedic Association National Joint Replacement Registry; BAR, Belgian Arthroplasty Register ORTHOpride; CJRR-Calif, California Joint Replacement Registry; CJRR-Canada, Canadian Joint Replacement Registry; DHR, Danish Hip Arthroplasty Register; DKR, Danish Knee Arthroplasty Register; FAR, Finnish Arthroplasty Register; FORCE-TJR, Function and Outcomes Research for Comparative Effectiveness in Total Joint Replacement; GAR, Geneva Arthroplasty Registry; HJR, Harris Joint Registry; HJRR, HealthEast Joint Replacement Registry; HSS, Hospital for Special Surgery Hip and Knee Joint Replacement Registry; INOR, Irish National Orthopaedic Register; KP-TJRR, Kaiser Permanente National Total Joint Replacement Registry; LAR, Lithuanian Arthroplasty Register; LROI, Dutch Arthroplasty Register; MARCQI, Michigan Arthroplasty Registry Collaborative Quality Initiative; NAR, Norwegian Arthroplasty Register; NJR, National Joint Registry for England, Wales, Northern Ireland and the Isle of Man; NZJR, New Zealand Joint Registry; RACat, Catalan Arthroplasty Register; RIAP, Italian Arthroplasty Registry Project; RIPO, Registro dell’implantologia Protesica Ortopedica (Register of the Orthopaedic Prosthetic Implants); SHAR, Swedish Hip Arthroplasty Register; SIRIS, Swiss Implant Register; SKAR, Swedish Knee Arthroplasty Register.
Obtained by linkage to other health data registries.