It's just a standard deviation!
Department of Anaesthesiology, The University of Hong Kong, Hong Kong Special Administrative Region. htswchoi@hku.hk.
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Choi
Department of Anaesthesiology, The University of Hong Kong, Hong Kong Special Administrative Region.
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Wong
D016001:Confidence Intervals; D003627:Data Interpretation, Statistical; D006801:Humans; D008433:Mathematics