138 Chapter 5 Table 6: Synthesis of the results on feasibility, measurement properties and relevance of the PROMIS measures for adults with in adults with von Willebrand disease. Feasibility Construct validity* Reliability Relevance† PROMIS measure SF-36v2 Number of items Floor/ceiling effects CATs Physical function Physical functioning + + ++ ++ + Pain interference Bodily pain - ± ++ ++ - Fatigue Vitality - ± ++ ++ Anxiety Mental health - ± + ++ - Depression Mental health - - + ++ - Ability to participate in social roles and activities Social functioning - + ++ ++ - Satisfaction with social roles and activities Social functioning - + ++ - Short form Anger ++ Fixed scale Global Health – physical health Physical functioning + + + Physical component summary + ± Global Health – mental health Mental health + - + Mental component summary + - * Construct validity was only determined for the PROMIS CATs Physical Function, Pain Interference, Fatigue, Anxiety, Depression, and Ability to Participate in Social Roles and Activities. † Relevance, as in comparison with the general Dutch population, was only determined for the PROMIS CATs Physical Function, Pain Interference, Anxiety, Depression. Ability to Participate in Social Roles and Activities, and Satisfaction with Social Roles and Activities. Interpretation: Number of items: + on average the mean number of CAT items shown was lower than the number of items on the SF-36v2, - on average the mean number of CAT items shown was higher than the number of items on the SF-36v2. Floor/ceiling: + no or less floor- and/or ceiling effects then the SF-36v2, ± similar floor- and/ or ceiling effects than the SF-36v2, - more floor- and/or ceiling effects then the SF-36v2. Relevance: + patients reported more symptoms than the general population, – patients reported fewer or similar symptoms than the general population. Construct validity: ++ all construct validity criteria are met, + not all construct validity criteria are met but >70% of the correlations between DPSP and DPDP are smaller than the correlation between SPDP, - construct validity criteria are not met and <70% of the correlations between DPSP and DPDP are smaller than the correlation between SPDP Reliability: ++ reliability coefficient or greatest lower bound ≥ 0.90, + reliability coefficient or greatest lower bound ≥ 0.70, - reliability coefficient or greatest lower bound ≤0.70. Abbreviations: CAT, Computer Adaptive Test; DPDP, different patient-reported outcome different patient-reported outcome measure; DPSP, different patient-reported outcome same patient-reported outcome measure; PROMIS, Patient Reported Outcomes Measurement Information System; SF-36v2, Short Form-36 version 2; SPDP, same patient-reported outcome different patient-reported outcome measure.
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