Meta-Analysis of Analgesic Effect (IMAGE) World Scientific Caption In meta-analysis of analgesic effect, the odds ratio (OR) was used as an index of the validity of the analgesic effect, and was presented at a 95 percent confidence interval (CI). Credit Wen-Dien Chang, Ph.D., Ping-Tung Lai, and Yung-An Tsou, Ph.D. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.