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Pk value does depend on the fineness of the observer scale.
Weber Jensen E, Rodríguez B, Litvan H. Weber Jensen E, et al. Acta Anaesthesiol Scand. 2005 Mar;49(3):427; author reply 428. doi: 10.1111/j.1399-6576.2005.00672.x. Acta Anaesthesiol Scand. 2005. PMID: 15752419 No abstract available.