Comparison of anchor-based and distributional approaches in estimating important difference in common cold
- PMID: 18027107
- DOI: 10.1007/s11136-007-9277-2
Comparison of anchor-based and distributional approaches in estimating important difference in common cold
Abstract
Context: Evaluative health-related quality-of-life instruments used in clinical trials should be able to detect small but important changes in health status. Several approaches to minimal important difference (MID) and responsiveness have been developed.
Objectives: To compare anchor-based and distributional approaches to important difference and responsiveness for the Wisconsin Upper Respiratory Symptom Survey (WURSS), an illness-specific quality of life outcomes instrument.
Design: Participants with community-acquired colds self-reported daily using the WURSS-44. Distribution-based methods calculated standardized effect size (ES) and standard error of measurement (SEM). Anchor-based methods compared daily interval changes to global ratings of change, using: (1) standard MID methods based on correspondence to ratings of "a little better" or "somewhat better," and (2) two-level multivariate regression models.
Participants: About 150 adults were monitored throughout their colds (1,681 sick days.): 88% were white, 69% were women, and 50% had completed college. The mean age was 35.5 years (SD = 14.7).
Results: WURSS scores increased 2.2 points from the first to second day, and then dropped by an average of 8.2 points per day from days 2 to 7. The SEM averaged 9.1 during these 7 days. Standard methods yielded a between day MID of 22 points. Regression models of MID projected 11.3-point daily changes. Dividing these estimates of small-but-important-difference by pooled SDs yielded coefficients of .425 for standard MID, .218 for regression model, .177 for SEM, and .157 for ES. These imply per-group sample sizes of 870 using ES, 616 for SEM, 302 for regression model, and 89 for standard MID, assuming alpha = .05, beta = .20 (80% power), and two-tailed testing.
Conclusions: Distribution and anchor-based approaches provide somewhat different estimates of small but important difference, which in turn can have substantial impact on trial design.
Similar articles
-
Validation of a short form Wisconsin Upper Respiratory Symptom Survey (WURSS-21).Health Qual Life Outcomes. 2009 Aug 12;7:76. doi: 10.1186/1477-7525-7-76. Health Qual Life Outcomes. 2009. PMID: 19674476 Free PMC article.
-
Validation of the Wisconsin upper respiratory symptom survey-24, Chinese version.Ann Med. 2022 Dec;54(1):655-665. doi: 10.1080/07853890.2022.2043559. Ann Med. 2022. PMID: 35196916 Free PMC article.
-
The Wisconsin Upper Respiratory Symptom Survey is responsive, reliable, and valid.J Clin Epidemiol. 2005 Jun;58(6):609-17. doi: 10.1016/j.jclinepi.2004.11.019. J Clin Epidemiol. 2005. PMID: 15878475 Free PMC article.
-
Comparison of the minimally important difference for two health state utility measures: EQ-5D and SF-6D.Qual Life Res. 2005 Aug;14(6):1523-32. doi: 10.1007/s11136-004-7713-0. Qual Life Res. 2005. PMID: 16110932 Review.
-
Screening for Cognitive Impairment in Older Adults: An Evidence Update for the U.S. Preventive Services Task Force [Internet].Rockville (MD): Agency for Healthcare Research and Quality (US); 2020 Feb. Report No.: 19-05257-EF-1. Rockville (MD): Agency for Healthcare Research and Quality (US); 2020 Feb. Report No.: 19-05257-EF-1. PMID: 32129963 Free Books & Documents. Review.
Cited by
-
Responsiveness and minimal important change of the Family Reported Outcome Measure (FROM-16).J Patient Rep Outcomes. 2024 Mar 26;8(1):38. doi: 10.1186/s41687-024-00703-1. J Patient Rep Outcomes. 2024. PMID: 38530614 Free PMC article.
-
Comparison of false positive and false negative rates of two indices of individual reliable change: Jacobson-Truax and Hageman-Arrindell methods.Front Psychol. 2023 Jul 13;14:1132128. doi: 10.3389/fpsyg.2023.1132128. eCollection 2023. Front Psychol. 2023. PMID: 37519369 Free PMC article.
-
Exploration of the methods of establishing the minimum clinical important difference based on anchors and their applications in the quality of life measurement scale QLICP-BR (V2.0) for breast cancer.Front Oncol. 2023 Mar 27;13:1123258. doi: 10.3389/fonc.2023.1123258. eCollection 2023. Front Oncol. 2023. PMID: 37051543 Free PMC article.
-
Comparison of 100 U With 200 U of Intradetrusor OnabotulinumToxinA for Nonneurogenic Urgency Incontinence.Female Pelvic Med Reconstr Surg. 2021 Mar 1;27(3):140-146. doi: 10.1097/SPV.0000000000001020. Female Pelvic Med Reconstr Surg. 2021. PMID: 33620895 Free PMC article. Clinical Trial.
-
Practical issues encountered while determining Minimal Clinically Important Difference in Patient-Reported Outcomes.Health Qual Life Outcomes. 2020 May 27;18(1):156. doi: 10.1186/s12955-020-01398-w. Health Qual Life Outcomes. 2020. PMID: 32460882 Free PMC article. Clinical Trial.
References
Publication types
MeSH terms
Grants and funding
LinkOut - more resources
Full Text Sources
Medical