歲月麻醉

Anesthesia,Joyful Life

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12 個標準差的境界


生物醫學的統計，描述正常分佈所涵蓋的面積，一般只用到1.96標準差，或者簡化為2標準差，大約是95%，通常看到的所謂95%信賴區間 (95% CI)即是用這樣的概念！個人看過使用3個標準差的地方，是在計算腦脊髓液密度與注射局麻藥物密度比的Baricity，為了要得到絕對的高比重溶液，因此將高於腦脊髓液平均密度的3個標準差（99.7%)，當作上限，而商業化的高比重藥物，通常透過加入葡萄糖來達成，又遠高於此頂標，以確保『絕對』的高比重。

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2009年10月6日 星期二 at 下午1:58

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