128 Chapter 5 consists of 5 items and assesses an individual’s self-reported angry mood, negative social cognitions and efforts to control anger 34. The fixed scale global health consists of 10 items and evaluates the individual’s health across five domains (physical function, pain, fatigue, emotional distress and social health) as well as the individual’s general health perception 35. All PROMIS measures use a 5-point Likert scale ranging from 1 (never or not at all) to 5 (almost always, cannot do or very much), except for the fixed scale global health. Global health uses different response categories for each item (e.g., ranging from excellent to poor), includes a visual analogue scale from 0 to 10 to assess pain intensity, and produces two component scores called physical health and mental health 35. The CATs automatically stopped when the standard error (SE) was ≤2.2 (95% reliability) and/or a maximum of 12 items per measure were administered. For the PROMIS CATs, T-scores were obtained using the KLIK PROM portal. The T-scores for the short form anger and fixed scale global health were obtained using the PROMIS Assessment Center Scoring Service (https://www.assessmentcenter.net/ac_scoringservice). All PROMIS measures use a 7-day recall period, except for physical function, ability to participate in social roles and activities, and satisfaction with roles and activities, which do not use a recall period. For all measures, higher scores represent more of the construct (e.g., more anger or better physical function). Dutch thresholds for categorizing the T-scores according to severity of the symptoms are available for all PROMIS measures except the short form v1.1 anger 35-38. Short Form-36 The Short Form-36 version 2 (SF-36v2) survey is a standardized generic instrument which assesses health-related quality of life across eight domains: 1) physical functioning, 2) social functioning, 3) role limitations due to physical health problems, 4) role limitations due to emotional problems, 5) general health, 6) mental health, 7) bodily pain, and 8) vitality 39. The number of items per domain ranges from 2 to 10, and when combined the complete SF-36v2 consists of 36 items. Six of the eight domains use a 3- to 6-point Likert scale, while the other two domains use a yes/no scale. For each domain, scores were converted to a 0-100 scale, with higher values reflecting a better quality of life. The recall period of the SF-36v2 varies from the moment of questionnaire completion to the previous four weeks 12.
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