Guidelines for administering the PRISS Scale

The PRISS has been designed as a self-administered form. In the case that the patient is unable to answer the questions independently, a hetero-administered version is available.

The scale can be completed digitally or in paper format.

In the self-report paper format, the patient will be provided with a copy of the instrument to complete it independently. In the hetero-administered paper format version, the interviewer will read the questions verbatim and will outline the response options for the patient. For questions referring to the level of worry and interference in daily life, the patient will be shown a cardboard with Likert-type scale options of emoticons representing the response options so the patient can indicate the appropriate response.

In both digital and paper formats, each item asks for the presence or absence of a symptom/experience in the last week and is scored as 0 = “Absent” or 1 = “Present”. When the symptom/experience is present, its frequency, level of concern and level of interference in daily life are queried. A 4-point Likert-type scale is used to score the frequency of the symptom/experience (1 = “Hardly never”; 2 = “Sometimes”; 3= “Often”; 4 = “Always”). To measure the level of worry and interference in daily life, a visual Likert-type scale employing emoticons is used, with 5 options (0 = “Not at all”; 1 = “Mild”; 2 = “Moderate”; 3 = “Severe”; 4 = “Extreme”).

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