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This study was designed to validate the Self-Report Habit Index (SRHI) for assessing habitual marijuana, alcohol, cigarette, and e-cigarette use.
Measures were questionnaires (self-report habit index, cues to action scale, purpose-made intention questionnaire, timeline follow-back questionnaire) and executive function tasks (Stroop, Tower of London, operation span).
Habit strength of dietary and physical activity behaviors was measured by means of the Self Report Habit Index [ 17].
Habitual behavior was assessed using an abbreviated version of the habit index of Verplanken and Orbell (2003).
After watching the film clips, participants completed the self-report habit index (SRHI; Verplanken & Orbell, 2003) to measure the extent to which ER had become a habitual process.
One hundred and nineteen studies (88%) have used the Self-Report Habit Index (SRHI) (or abbreviations thereof), which is designed to capture automaticity (Verplanken & Orbell, 2003).
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Descriptive statistics for the habit indices were computed for sample description purposes.
Others reveal problems inherent to habit indices and may necessitate methodological and conceptual refinements.
'Think-aloud' methods have not been used to examine habit self-reports, but may prove fruitful in documenting problems in participants' comprehension of habit indices.
The validity of self-report habit measures has been assumed based on convergence with other habit indices and on prediction of self-reported behaviour (Gardner, Abraham, et al., 2012; Ouellette & Wood, 1998; Verplanken & Orbell, 2003).
The trial aims to increase the mean overall sun protection habits index score from 2.3 to 2.7 with a standard deviation of 0.5 (effect size of 0.5) and the proportion of people who conduct a whole-body skin self-examination by an absolute 10%.
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