Webster graph (IMAGE) PNAS Nexus Caption The mean increase in observed cases of disease above that predicted without prior disease. Numbers of diseases in each bar are indicated by N, with (F) for women and (M) for men. Credit A. J. Webster Usage Restrictions None License Original 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.