Figure 1.

Relative frequency polygons for GHQ-12 score. GHQ-12 was scored by three different methods. In each method of scoring, the proportions of subjects with each score were plotted. Vertical dotted lines indicated the cutoff points for each scoring method.

Toyabe et al. BMC Public Health 2007 7:175   doi:10.1186/1471-2458-7-175
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