Formulae for calculating standard deviations

National Collaborating Centre for Mental Health (UK)

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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.)

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

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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)

\begin{array}{l} SD = Standard Error \times \sqrt n \end{array}

\begin{array}{l} SD = \frac{(upper 95 % Confidence Interval - mean)}{1.96} \times \sqrt n \end{array}

\begin{array}{l} SD = \frac{({mean}_{1} - {mean}_{2})}{\sqrt F (\frac{\sqrt 1}{n_{1}}) + (\frac{\sqrt 1}{n_{2}})} \end{array}

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

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Bookshelf ID: NBK56477

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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.) Appendix 10, Formulae for calculating standard deviations.
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Obsessive-Compulsive Disorder: Core Interventions in the Treatment of Obsessive-Compulsive Disorder and Body Dysmorphic Disorder.

Appendix 10Formulae for calculating standard deviations

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