Fig. 4. The graph shows the main outcome variables of the best three regimens. (Top ) Means and SDs of pain score and number of epidural bolus doses administered in case of inadequate analgesia. (Middle ) Means and SDs of systolic blood pressure (BP), heart rate (HR), oxygen saturation using pulse oximetry (SpO2), and respiratory rate (RR). (Bottom ) Means and SDs of sedation score and percentage of assessments at which nausea and pruritus were recorded. See table 6for side effects requiring discontinuation of the epidural regimen.