Distribution of propensity scores, defined as the probability of being selected into the NHANES-III cohort, by study (NHANES-III, OAI).

<p>The propensity score (x-axis) is defined as the probability of being selected into the NHANES-III cohort. The percentage of individuals with that propensity score (estimated using Kernel density estimation) in each cohort is shown on the y-axis. The solid line represents NHANES-III, while the dashed line represents OAI.</p

Comparison of NHANES-III and OAI study characteristics.

<p>Comparison of NHANES-III and OAI study characteristics.</p

Demographic and clinical features of NHANES-III and OAI participants between the ages of 60 and 79 with radiographic knee OA.

<p>*Percentages are weighted using the NHANES-III sampling weights.</p

Comparison of the proportion of participants in fair or poor health from in OAI and NHANES-III.

<p>On the x-axis is the analysis type and on the y-axis is the percent in fair/poor health. The trimmed sample is defined as participants with propensity scores between 0.2 and 0.8. Dark bars represent OAI, while gray bars represent NHANES-III.</p

Unadjusted proportion of being in fair or poor health for persons with radiographic knee OA from each study (OAI, NHANES-III).

<p>*Percentages are weighted using the NHANES-III sampling weights.</p><p>**Percentage of persons in fair/poor health was not estimated because there were zero persons with a missing race and missing knee pain in NHANES-III.</p><p>***Percentage of persons in fair/poor health was not estimated because there was only one person with a missing obesity status and missing knee pain status in OAI.</p

Addition file 1: Table S1.

MEDLINE, EMBASE, COCHRANE AND PUBMED Search strategies; List of search strings and keywords used to identify studies in different databases. (DOCX 182 kb

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