GRAPHIC DATA REPRESENTATION IN ANESTHESIOLOGICAL JOURNALS - A PROPOSED METHODOLOGY FOR ASSESSMENT OF APPROPRIATENESS

Few authors have addressed the topic of graphic data presentation. The purpose of our study was to combine several guidelines in order to ev aluate three anaesthesiology journals listed in Index Medicus (Austral ian, American and Italian) in terms of the appropriateness and the qua lity of presentation of graphs. Our analysis was based on concepts exp ressed by Cox and Tufte. We calculated the optimization of the amount of information in each graph using two parameters: Data Density Index (DDI) and Data Ink Ratio (DIR). The correctness and clearness of each component of the graph (scale, title, axes, legends and abbreviations) was evaluated on the basis of a binary score. We analysed 300 explora tory plots, quantitative graphs and summaries of statistical analysis. About 50% of papers had more than three graphs. Mean scores were 3.22 for the Italian journal, 3.47 for the American journal and 3.82 for t he Australian journal. Tufte parameters were calculated on 42 scatterp lots: DDI was 5.4+/-13.9 and DIR was 0.7+/-0.1. The criteria applied i n our study appear sufficiently sensitive to differentiate the quality of graphs.