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The data on corn size and treatment group (corn plaster or scalpel) are shown in Figure 2.5 as a dot plot. This method of presentation retains the individual subject values and clearly demonstrates any similarities or differences between the groups in a readily appreciated manner. An additional advantage is that any outliers will be detected by such a plot. However, such presentation is not usually practical with large numbers of subjects in each group because the dots will obscure the details of the distribution. Figure 2.5 shows that the two randomised groups had similar distributions of corn sizes at baseline.

Figure 2.5 Dot plot showing corn size (in mm) by randomised treatment group for 200 patients with corns.

(Source: data from Farndon et al. 2013).