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Patient State Index, heart rate, square root of the mean of the sum of the squares of differences between adjacent N-N intervals (RMSSD), and percentage of difference between adjacent N-N intervals >50 ms (pNN50) between deep and light sedation. The horizontal lines inside the boxes represent the medians. The boxes encompass the 25th through the 75th percentile, and the error bars indicate the outermost data points other than outliers.
