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Ann Thorac Surg 2003;75:1066
© 2003 The Society of Thoracic Surgeons

Correspondence

The use of Z scores in assessing neuropsychological change after cardiac operations

Donald Whitaker, FRCS(Ed)

Department of Cardiac Surgery, The Royal Sussex County Hospital, Eastern Rd, Brighton BN2 5BE, UK

e-mail: donaldcwhitaker@yahoo.co.uk

The first 20% of the full text of this article appears below.

To the Editor:

I read with considerable interest the recent review by Collie and associates [1] concerning statistical analysis of cognitive change after coronary artery surgical procedures. It is agreed that the percent change and standard deviation "cutoff" methods of deficit analysis are arbitrary, do not take practice effects into account, and are relatively insensitive, especially as the incidence of cognitive decline has decreased. The main alternative advocated [2], group mean analysis . . . [Full Text of this Article]




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