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Gall, Gall, and Borg (2003) state that the extreme groups method assumes that extreme groups are more likely to differ on the measured variables than comparison groups that also differ on score distribution.
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As expected, the groups differed on scores of OCD symptom severity as measured by the Yale-Brown Obsessive Compulsive Scale (28) and the Obsessive-Compulsive Inventory Revised (29).
We used known group analysis to examine the differences in DMSRQ-SF scale scores between respondents who were expected to differ on these scores, i.e. those using different medications and medication delivery systems.
'Known group' validity was assessed by examining differences in DMSRQ-SF scale scores between respondents using different treatment regimens who were expected to differ on these scores.
Third, it was investigated whether occupations classified in one DOT-category, could significantly differ on UEWD-scores.
The TBI group had significantly lower admission motor subscale scores than the NTBI group, but the groups did not differ on cognitive scores.
Genotype groups also did not differ on CEA scores (F2,245 = 2.44, P = 0.09) (post hoc tests also non-significant).
A series of one-way ANOVAs indicated no significant differences between the high and low trait rumination groups on age, BMI, or any of the sleep variables (i.e., sleep onset latency, total sleep time, sleep quality), though they did differ on BDI scores (Table 1).
But they differ on scale.
However, mothers and fathers did not significantly differ on the clinical score of depression.
Children diagnosed earlier or later did not differ on mean total score on a standardised interview for autism.
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CEO of Professional Science Editing for Scientists @ prosciediting.com