95% CI = 95% confidence interval; NA = not applicable.
Erratum: Errors in Tables 1 and 2 in Article by Krishnan et al (Arthritis Rheum August 2007)
Article first published online: 1 AUG 2011
Copyright © 2011 by the American College of Rheumatology
Arthritis Care & Research
Volume 63, Issue 8, page 1202, August 2011
How to Cite
- Issue published online: 1 AUG 2011
- Article first published online: 1 AUG 2011
In the article by Krishnan et al published in the August 2007 issue of Arthritis Care & Research (formerly cited as Arthritis Rheum) (pp. 1038–42), the authors used data from the Nationwide Inpatient Sample (NIS), a large, restricted-access, publicly available dataset that is maintained by the Agency for Healthcare Research and Quality (AHRQ). One of the provisions of the NIS Data Use Agreement is that no data observation involving less than or equal to 10 observations is to be published. This measure was put in place by AHRQ to protect individual patients' privacy and to prevent the potential disclosure of personal information. In the article by Krishnan et al, there are some tabulated cells in Tables 1 and 2 that are in violation of this provision. This represents an inadvertent failure by the authors to comply with the Data Use Agreement. Although the authors are confident that nothing in the article could be used to identify individuals or their personal information, the fact remains that the disclosures are in violation of the AHRQ guidelines. The corrected versions of Tables 1 and 2 are shown, the authors request that these corrected versions be cited.
|No. of hospitalizations||No. of deaths (percentage died in hospital)||Mortality rate (95% CI)||No. of hospitalizations||No. of deaths (percentage died in hospital)||Mortality rate (95% CI)||Risk-adjusted hazards ratio (95% CI)†|
|All causes||1.6 million||149,183 (9.1)||4.50 (4.47–4.52)||41,335||5,033 (12.2)||6.1 (5.9–6.3)||1.36 (1.32–1.40)|
|Knee arthroplasty||2,052||26 (1.3)||0.8 (0.6–1.2)||<10||0.0 (0.0)||0.0||NA|
|Hip arthroplasty||33,851||1,597 (4.7)||2.3 (2.2–2.4)||678||45 (66)||3.2 (2.4–4.3)||1.45 (1.10–1.95)|
We regret the error.