Research Article
Psychometric Evaluation of the Perceived Stress Scale in Multiple Sclerosis
Table 4
Floor effects and ceiling effects, reliability coefficients, and item-total correlations. Floor effects refer to the percentage of participants who reported the lowest possible score. Ceiling effects refer to the percentage of participants who reported the highest possible score. For floor and ceiling effects, more than 15% of the sample reporting the lowest or highest score is indicative of a floor or ceiling effect. Cronbach’s alphas are ideally above .70 and item-total correlations should be above .40.
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PSS: Perceived Stress Scale. |