I have found many papers that use the State-Trait Anxiety Inventory (STAI) trait part of the questionnaire to divide participants into low and high anxiety groups.
However, I want a scoring criteria to exclude participants with very low STAI trait anxiety and include all other participants (i.e., those with medium to high anxiety). The participants will not be clinical though but healthy populations.
Can anyone recommend papers that report the 25th or lower percentile of participants that score low on the STAI trait measure?
Since the resulting score is supposed to be measuring a continuous trait, can you give more background why you want to use a cut score?
Dear Victor,
Divide your participants in 4 groups and take away the lowest 25%, then you just tell in your method section that presently you did so (or in 3 groups and remove the lowest third).
https://en.wikipedia.org/wiki/State-Trait_Anxiety_Inventory
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Like Daniel, I am curious about using a cut score. The continuous score generally offers information that may be more meaningful.
Be careful of using the STAI in a non-clinical population - you risk encountering floor effects where only the "higher" scoring levels of "normal" anxiety will register- You might be better using something designed for the general population.
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