Letters to the Editor   |    
James G. Wright, MD, MPH, FRCSC1
1 Division of OrthopaedicsThe Hospital for Sick Children555 University Avenue, Room S-107Toronto, ON M5G 1X8, Canada james.wright@sickkids.ca
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In support of his research for or preparation of this manuscript, the author received grants or outside funding from the R.B. Salter Chair of Pediatric Surgical Research. The author received no payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the author is affiliated or associated.

The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 2006 Feb 01;88(2):448-a-448
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To The Editor:I disagree with Dr. Zarins' recent editorial "Are Validated Questionnaires Valid?" (2005;87:1671-2). He concludes that "subjective information is insufficient for evaluating the results of an operation" and "subjective data, no matter how valid, should not stand alone."The essence of Dr. Zarins' argument is that subjective measurements are sometimes used inappropriately. His main example is that measures developed in one context are sometimes being used inappropriately in another. He also states that finding a relationship between independent variables does not mean that one caused the other.
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