A matched case-control design is one in which an investigator has identified individuals (cases) with Disease Y. There is also a group (controls) who has not contracted Disease Y. The investigator wishes to determine if Exposure X is related to Disease Y. However, the cases and controls differ on more than just the exposure variable. Therefore, the investigator selects characteristics that may be confounders, such as age, gender, socioeconomic status, etc. and for each case identifies a control who has the same values on the confounding variables that are being matched on. Sometimes, investigators will select more than 2 or more controls for each case, but it's a matched design. Each case has its own control. Hope this helps.
Karen Scheltema, M.A, M.S. Senior Statistician HealthEast Research and Education Department, Midway Campus 1700 University Ave W St. Paul, MN 55104 Ph: (651) 232-5212 fax: (651) 641-0683 mailto:[EMAIL PROTECTED] -----Original Message----- From: Peter Frank [mailto:[EMAIL PROTECTED] Sent: Friday, July 25, 2003 11:04 AM To: [EMAIL PROTECTED] Subject: Re: Paired data other than from before/after experiments? [EMAIL PROTECTED] (Scheltema, Karen) wrote: >Case-Control designs in health sciences data. Could you give an example? Are the controls and cases different indviduals? Peter . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . ================================================================= The information included in this e-mail message, including any attachments, is intended only for the person or organization to which it is addressed. This e-mail message may contain information that is privileged or confidential. If you receive this e-mail message and are not the intended recipient or responsible for delivering the message to the intended recipient, you may not use, disseminate, distribute or copy the information included in this e-mail and any attachments. If you received this e-mail message by mistake, please reply by e-mail and destroy all copies of this message and any attachments. Thank you. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
