Fig. 2From: Effect of perioperative use of parecoxib on chronic post-surgical pain in elderly patients after hepatectomy: a prospective randomized controlled studyPrimary outcomes: incidence of CPSP at 3 months. CPSP, chronic post-surgical pain. Length of black bars for 95% CI of the incidence. For parecoxib group, 95% CI 23.6–49.0%. For the placebo group, 95% CI: 32.0–57.6%Back to article page