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How were the confidence intervals for proportions (%) calculated?

April 26, 2017calculated confidence intervals proportions

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How were the confidence intervals for proportions (%) calculated?

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The confidence intervals of the proportion items (those indicated as percentages) were calculated using the recommended method from Altman, D.G., Machin, D. et al. Statistics with confidence 2nd edition; BMJ Books. 2000. The recommended method has better statistical properties than the traditional method, generates asymmetric values and can be used for any data.