The psychopathology of everyday art: a quantitative Study - World ...

with a thin painted line; or where a thick painted line appeared together with a
thin drawn line;
2. There was no form measurement; and
3. Space was rated as an estimate of how full the picture was in tenths, whereas
further development changed to the more successful 'bubble method' presently
used in Version 3 (main study) and interrater study. Version 2 of the DAPA
rating guide can be found in Appendix 4. Scoring procedures were the same.
Treatment of missing data
Painting Combination: Not all the subjects completed all the paintings. This could
produce bias, as content in the early paintings is therefore emphasised. A Kruskal-Wallis
ANOVA performed on the groups and the number of paintings each patient completed
suggested a trend (_ 2 9.22, df=4, p=0.056). The number of paintings from each patient
was collapsed into three ordered categories (1; 2, or 3; 4 or 5), and two-way ANOVAs
(No. of paintings by diagnostic type) were performed on four significant variables. The
variable scores did not vary with the number of paintings (F=0.02-0.52, df=2, N.S.), and
there were no significant interaction effects (F=0.43-0.59, df=6, N.S.).
Outliers: no extreme values were excluded in study 1 as this was an exploratory study
and numbers were too small to determine whether these were important.
Distribution of data: There was no need for transformation of data for the initial study
as the Kolmogorov-Smirnov goodness of fit test revealed a normal distribution over the
variable spread. Most of the raw data was rank-ordered or classificatory, but the final
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