Table 2. Comparison of Three definitions of OA using MEPS data.
Definition‡ | Performance Measures (2008 - 2010)* | Annual Prevalence 2008 - 2011* |
Symptomatic† 2008 - 2011* |
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---|---|---|---|---|---|---|---|---|---|---|
| ||||||||||
Sensitivity‡ (95% CI) |
Specificity‡ (95% CI) |
PPV‡ (95% CI) | sample n |
estimate |
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millions | (%) | % | ||||||||
Strict | 34.6 | (31.5 – 37.8) | 97.5 | (97.2 – 97.9) | 33.5 | (29.3 – 37.6) | 4,838 | 14.4 | (6.3) | 92.3% |
Expanded | 73.8 | (71.1 – 76.5) | 90.5 | (89.8 – 91.1) | 26.3 | (24.1 – 28.5) | 19,035 | 51.4 | (22.4) | 89.1% |
Probable | 62.9 | (59.8 – 65.9) | 93.5 | (93.0 – 94.0) | 31.4 | (28.8 – 34.1) | 11,230 | 30.8 | (13.4) | 91.8% |
Calculation of performance measures requires the use of restricted MEPS-MPC data; 2011 MPC data was not available when our access to these data was granted.
Assessed with the following question asked at the first and last assessment at each year “[Have/Has] [PERSON] had pain, aching, stiffness or swelling around a joint in the past 12 months?”.
Strict, ICD-9-CM diagnosis 715; Expanded, ICD-9-CM diagnosis 715 , 716, or 719; Probable, ICD-9-CM 715 OR [716 or 719 AND prior non-RA arthritis diagnosis – assessed with a question asked of all adults “(Have/Has) (PERSON) ever been told by a doctor or other health professional that (PERSON) had arthritis?” and a follow-up question prompting the individual for the type of arthritis].
Sensitivity estimated on Subset A – participants with at least one MEPS-MPC medical counter diagnosis (n=24,022). Specificity and PPV estimated on Subset B – participants with MEPS-HC condition associated with at least one MEPS-MPC medical encounter diagnosis matched to a HC diagnosis (n=20,372).
OA, osteoarthritis; MEPS, Medical Expenditure Panel Survey; CI, Confidence Interval; PPV, Positive Predictive Value; ICD-9-CM, International Classification of Diseases Version 9 Clinical Modification; MPC, Medical Provider Component; HC, Household Component.