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Table 1 Observer’s Assessment of Alertness and Sedation (OAAS) scale (Hong et al., 2003)

From: Comparison of target controlled infusion and manual infusion of propofol for sedation in spinal anesthesia

ScaleAlertness degree
5Fully awake
3With eyes closed, but responsive to verbal stimulation immediately
2With eyes closed, only responsive to physical stimulation
1No response to physical stimulus