Abstract:
BACKGROUND:Invariant item ordering (IIO) is defined as the extent to which items have the same ordering (in terms of item difficulty/severity - i.e. demonstrating whether items are difficult [rare] or less difficult [common]) for each respondent who completes a scale. IIO is therefore crucial for establishing a scale hierarchy that is replicable across samples, but no research has demonstrated IIO in scales of psychological distress. We aimed to determine if a hierarchy of distress with IIO exists in a large general population sample who completed a scale measuring distress. METHODS:Data from 4107 participants who completed the 12-item General Health Questionnaire (GHQ-12) from the Northern Ireland Health and Social Wellbeing Survey 2005-6 were analysed. Mokken scaling was used to determine the dimensionality and hierarchy of the GHQ-12, and items were investigated for IIO. RESULTS:All items of the GHQ-12 formed a single, strong unidimensional scale (H=0.58). IIO was found for six of the 12 items (H-trans=0.55), and these symptoms reflected the following hierarchy: anhedonia, concentration, participation, coping, decision-making and worthlessness. LIMITATIONS:The cross-sectional analysis needs replication. CONCLUSIONS:The GHQ-12 showed a hierarchy of distress, but IIO is only demonstrated for six of the items, and the scale could therefore be shortened. Adopting brief, hierarchical scales with IIO may be beneficial in both clinical and research contexts.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Doyle F,Watson R,Morgan K,McBride Odoi
10.1016/j.jad.2011.10.022subject
Has Abstractpub_date
2012-06-01 00:00:00pages
85-8issue
1eissn
0165-0327issn
1573-2517pii
S0165-0327(11)00671-9journal_volume
139pub_type
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