The Temporal Stability and Construct Validity of Measures Assessing Mania Symptoms and Risk: A Comparative Analysis
Fluctuations in mood and activity levels are defining features of bipolar disorder, but the temporal stability of measures used to assess symptoms and traits relevant to bipolar disorder is unclear. This study examined the short-term stability of several widely used, contemporary bipolar disorder measures (e.g., Altman Self-Rating Mania Scale, General Behavior Inventory, Hypomanic Personality Scale, Mood Disorder Questionnaire) over a period of roughly 2 weeks (M Retest Interval = 15.17 days) in an undergraduate sample. The stability correlations varied widely, ranging from .49 to .83. As would be expected, measures that were designed to assess traits related to bipolar disorder tended to show stronger stability than scales purporting to assess more transient symptoms of bipolar disorder. Other analyses revealed that—consistent with previous research—some bipolar disorder scales demonstrated moderate to strong positive relations with neuroticism/negative affect and other psychopathology, whereas others related weakly to such measures but showed more robust positive relations with extraversion/positive affect. Taken together, our findings suggest that it is important to consider administration instructions (e.g., trait vs. symptom ratings), subscale properties, and item format when selecting study measures in bipolar disorder research.