U.S. flag

An official website of the United States government

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.

National Collaborating Centre for Mental Health (UK). Obsessive-Compulsive Disorder: Core Interventions in the Treatment of Obsessive-Compulsive Disorder and Body Dysmorphic Disorder. Leicester (UK): British Psychological Society (UK); 2006. (NICE Clinical Guidelines, No. 31.)

Cover of Obsessive-Compulsive Disorder

Obsessive-Compulsive Disorder: Core Interventions in the Treatment of Obsessive-Compulsive Disorder and Body Dysmorphic Disorder.

Show details

Appendix 10Formulae for calculating standard deviations

The following formulae were used to calculate standard deviations (SD) where these were not available in study reports:

(n = sample size of group)

SD=Standard Error×n
SD=(upper95%Confidence Interval-mean)1.96×n
SD=(mean1-mean2)F(1n1)+(1n2)

(If F ratio is not given, then F = t2)

Copyright © 2006, The British Psychological Society & The Royal College of Psychiatrists.

All rights reserved. No part of this book may be reprinted or reproduced or utilised in any form or by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying and recording, or in any information storage or retrieval system, without permission in writing from the publishers. Enquiries in this regard should be directed to the British Psychological Society.

Bookshelf ID: NBK56477

Views

  • PubReader
  • Print View
  • Cite this Page
  • PDF version of this title (1.2M)

Recent Activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...