Figure 1. Event-rate scatter. Early and late emetic event rates with ondansetron (any dose and route) compared with control (placebo or no treatment). Symbols are comparisons between ondansetron and control arms. One trial may report one to three different emetic events (see key), both early and late. A scatter lying predominantly between the line of equality (dotted) and the y-axis indicates consistent efficacy of ondansetron compared with control and relative homogeneity of the data set. The area of the symbols does not account for trial size.