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National Collaborating Centre for Mental Health (UK). Self-Harm: The Short-Term Physical and Psychological Management and Secondary Prevention of Self-Harm in Primary and Secondary Care. Leicester (UK): British Psychological Society; 2004. (NICE Clinical Guidelines, No. 16.)

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Self-Harm: The Short-Term Physical and Psychological Management and Secondary Prevention of Self-Harm in Primary and Secondary Care.

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Appendix 12Methods 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 x √n

SD=(upper 95%Confidence Interval-mean)1.96×n
SD=(mean1-mean2)F(1/n1+1/n2)

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

Copyright © 2004, 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: NBK56393

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