Linking Physical and Mental Health Summary Scores from the Veterans RAND 12-Item Health Survey (VR-12) to the PROMIS® Global Health Scale

Abstract

BACKGROUND: Global health measures represent an attractive option for researchers and clinicians seeking a brief snapshot of a patient's overall perspective on his or her health. Because scores on different global health measures are not comparable, comparative effectiveness research (CER) is challenging. OBJECTIVE: To establish a common reporting metric so that the physical and mental health scores on the Veterans RAND 12-Item Health Survey (VR-12 © ) can be converted into scores on the corresponding Patient Reported Outcomes Measurement Information System (PROMIS ® ) Global Health scores. DESIGN: Following a single-sample linking design, participants from an Internet panel completed items from the PROMIS Global Health and VR-12 Health Survey. A common metric was created using analyses based on item response theory (IRT), producing score cross-walk tables for the mental and physical health components of each measure. The linking relationships were evaluated by calculating the standard deviation of differences between the observed and linked PROMIS scores and estimating confidence intervals by sample size. PARTICIPANTS: Participants (N=2025) were 49 % male and 73 % white; mean age was 46 years. MAIN MEASURES: Mental and physical health subscales of the PROMIS Global Health and the VR-12. The mean VR-12 physical component and mental component scores were 45.2 and 46.6, respectively; the mean PROMIS physical and mental health scores were 48.3 and 48.5, respectively. KEY RESULTS: We found evidence that the combined set of VR-12 and PROMIS items were relatively unidimensional and that we could proceed with linking. Linking worked better between the physical health than mental health scores using VR-12 item responses (vs. linking based on algorithmic scores). For each of the cross-walks, users can minimize the impact of linking error with modest increases in sample sizes.CONCLUSIONS: VR-12 scores can be expressed on the PROMIS Global Health metric to facilitate the evaluation of treatment, including CER. Extending these results to other common measures of global health is encouraged.

Teoria da resposta ao item nas pesquisas em saúde pública

“…It was identified the adoption of this model in 11 studies that applied IRT in public health research. 29,42,46,50,55,68,70 Another finding evidenced in this study refers to the use of the generalized partial credit IRT (GPCM) model for polytomic items in public health research. 77 The model is related to items with IRT's gradual politomic responses and considers the probabilities of choice for each of the response categories as adopted in eight scientific studies related to public health.…”

“…Waller 56 Develop a measure Knowledge about HPV ML1P, ML2P, ML3P Bevans 57 Calibrate a bank of items Quality of life CAT Hahn 58 Develop a measure Social health in chronic diseases ML2P; DIF Onishi 59 Develop a measure Symptoms of ascites in cirrhosis MCPG Ravens-Sieberer 21 Develop an adaptive test Quality of life related to child health MCPG Rose 60 Calibrate a bank of items Physical function MRG Spiegel 61 Develop a measure Gastrointestinal symptoms MRG Zhong 62 Assess reliability and validity 68 Develop a measure Physical and mental health MRG Teicher 69 Develop a measure Exposure to maltreatment and abuse…”

“…49 harmonize, together, the results of other research. 44,63,68 With the purpose of developing or evaluating instruments as well as evaluating latent traits, the one-dimensional, one-, twoor three-parameter model was the most recurrent and used in 17 studies analyzed. The logistic model of three parameters (ML3) 74 is the most complete because, in addition to the parameters of difficulty and discrimination of the items, it also considers the likelihood of success at random when the respondent has a low level of fitness or latent trait.…”

Establishing a common metric for self‐reported anxiety in patients with prostate cancer: Linking the Memorial Anxiety Scale for Prostate Cancer with PROMIS Anxiety

“…16 To the best of our knowledge, until recently it has been unclear how scores obtained from one anxiety instrument should be compared with another. [17][18][19][20][21] Other than skin cancer, prostate cancer is the leading cancer diagnosis among American men. prose ttast one.org) to link several commonly used generic anxiety instruments to the PROMIS Anxiety metric, using linking methods and IRT.…”

“…To our knowledge to date, such linking between PROMIS and legacy measures has been done only with generic measures of anxiety, depression, physical function, pain, and fatigue. [17][18][19][20][21] Other than skin cancer, prostate cancer is the leading cancer diagnosis among American men. 22 Although incidence rates are declining, 23 prostate cancer and its treatments are associated with significant anxiety over the long term.…”