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Mean and s.d. of total pain scores (VAS in mm) for groups receiving intravenous PCA with 1 mg incremental doses of morphine sulphate delivered either over 40 s (□) or over 5 min (
) (upper panel). Mean and s.d. of morphine sulphate use by patients receiving intravenous PCA with delivery over 40 s or over 5 min (lower panel). Data for both panels are for 12 h time segments.
