DClinPsy Portfolio Volume 1 of 3 - University of Hertfordshire ...

Comparison Mean difference (SE) Z p value Effect size
1. Alcohol use
(1-tailed) (Cohen’s d)
yes/no - inflexibility
-3.189 -1.16 0.12 0.29
2. Drug use
yes/no - Inflexibility
-1.31 -0.39 0.35 0.11
As can be seen above there is no significant difference between the groups that reported
drug or alcohol use from the group that did not on inflexibility, and the effect sizes are
small.
3) Inflexibility in relation to academic performance in school
Of those participants who answered the question on their maths set (n=91) there were 35
(38%) in the top set, 40 (44%) in the middle set and 16 (18%) in the lower set. Boxplots
(Figure 19) and descriptive statistics (Table 25) can be found in Appendix 13. There was
no significant difference between the maths group on levels of inflexibility as indicated
by using a Kruskal-Wallis Test, Chi Square = 2.26, (df = 2), p = 0.32.
4) Differences in the eating disorder and mental illness family histories between the
EDR risk groups
As can be seen from Table 26 below of those that reported a history of ED in their family
5 (8%) were in the low EDR group, 2 (12%) were in the moderate EDR group and 3
(30%) were in the high EDR group. As regards the mental illness history reported, 9
(14%) were in the low EDR group, 1 (10%) moderate and 1 (10%) in the high EDR
group.
Table 26- Counts and percentages for EDR groups in relation to ED history and mental
illness history
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