Mapping the Patient-Oriented Prostate Utility Scale From the Expanded Prostate Cancer Index Composite and the Short-Form Health Surveys

Nov 1, 2021, 00:00
10.1016/j.jval.2021.03.021
https://www.valueinhealthjournal.com/article/S1098-3015(21)01542-4/fulltext
Title : Mapping the Patient-Oriented Prostate Utility Scale From the Expanded Prostate Cancer Index Composite and the Short-Form Health Surveys
Citation : https://www.valueinhealthjournal.com/action/showCitFormats?pii=S1098-3015(21)01542-4&doi=10.1016/j.jval.2021.03.021
First page : 1676
Section Title : PREFERENCE-BASED ASSESSMENTS
Open access? : No
Section Order : 1676

Objectives

This study aimed to develop mapping algorithms from the Expanded Prostate Cancer Index Composite (EPIC) and the Short-Form (SF) Health Surveys to the Patient-Oriented Prostate Utility Scale (PORPUS), an econometric instrument specifically developed for patients with prostate cancer.

Methods

Data were drawn from 2 cohorts concurrently administering PORPUS, EPIC-50, and SF-36v2. The development cohort included patients who had received a diagnosis of localized or locally advanced prostate cancer from 2017 to 2019. The validation cohort included men who had received a diagnosis of localized prostate cancer from 2014 to 2016. Linear regression models were constructed with ln(1 − PORPUS utility) as the dependent variable and scores from the original and brief versions of the EPIC and SF as independent variables. The predictive capacity of mapping models constructed with all possible combinations of these 2 instruments was assessed through the proportion of variance explained (R ) and the agreement between predicted and observed values. Validation was based on the comparison between estimated and observed utility values in the validation cohort.

Results

Models constructed with EPIC-50 with and without SF yielded the highest predictive capacity (R  = 0.884, 0.871, and 0.842) in comparison with models constructed with EPIC-26 (R  = 0.844, 0.827, and 0.776). The intraclass correlation coefficient was excellent in the 4 models (>0.9) with EPIC and SF. In the validation cohort, predicted PORPUS utilities were slightly higher than those observed, but differences were not statistically significant.

Conclusions

Mapping algorithms from both the original and the abbreviated versions of the EPIC and the SF Health Surveys allow estimating PORPUS utilities for economic evaluations with cost-utility analyses in patients with prostate cancer.

Categories :
  • Instrument Development, Validation, & Translation
  • Methodological & Statistical Research
  • Oncology
  • Patient-Centered Research
  • Patient-reported Outcomes & Quality of Life Outcomes
  • PRO & Related Methods
  • Specific Diseases & Conditions
Tags :
  • EPIC
  • health utility measures
  • localized prostate cancer
  • mapping
  • patient-reported outcomes
  • PORPUS
Regions :
  • North America
ViH Article Tags :