Birkmeyer et al
1used data from Medicare claims files to demonstrate a 4-fold difference in the in-hospital mortality rate for major pancreatic surgery between centers with a high volume (4.1%) and a very low volume (16.1%) of these procedures. They also demonstrated evidence of a trend for decreased in-hospital mortality with higher surgical volumes by using the Mantel extension test.
- Birkmeyer JD
- Finlayson SRG
- Tosteson ANA
- Sharp SM
- Warshaw AL
- Fisher ES
Effect of hospital volume on in-hospital mortality with pancreaticoduodenectomy.
Surgery. 1999; 125: 250-256
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- Effect of hospital volume on in-hospital mortality with pancreaticoduodenectomy.Surgery. 1999; 125: 250-256
- Effect of nondifferential misclassification on estimates of odds ratios with multiple levels of exposure.Am J Epidemiol. 1992; 136: 356-362
- Does nondifferential misclassification of exposure always bias a true effect toward the null value?.Am J Epidemiol. 1990; 132: 746-748
© 2000 Mosby, Inc. Published by Elsevier Inc. All rights reserved.