Fig. 4. Pain scores at rest and while coughing (0–100 visual analogue scale). Boxes represent interquartile range, errors bars are the 10th and 90th percentiles. A horizontal line indicates median values. Pain scores at rest, but not while coughing, are significantly higher at early and late time points in the saline group. There are no significant differences in pain scores between intrathecal morphine doses. VAS = visual analog scale.