Title | Short-Term Repeatability of Insulin Resistance Indexes in Older Adults: The Atherosclerosis Risk in Communities Study. |
Publication Type | Journal Article |
Year of Publication | 2018 |
Authors | Poon AK, Meyer ML, Reaven G, Knowles JW, Selvin E, Pankow JS, Couper DJ, Loehr LR |
Secondary Authors | Heiss G |
Journal | J Clin Endocrinol Metab |
Volume | 103 |
Issue | 6 |
Pagination | 2175-2181 |
Date Published | 2018 06 01 |
ISSN | 1945-7197 |
Keywords | Aged, Aged, 80 and over, Atherosclerosis, Biomarkers, Blood Glucose, Cholesterol, HDL, Female, Glucose Tolerance Test, Humans, Insulin, Insulin Resistance, Male, Prospective Studies, Reproducibility of Results |
Abstract | Context: The homeostatic model assessment of insulin resistance (HOMA-IR) and triglyceride (TG)/high-density lipoprotein cholesterol (HDL-C) ratio (TG/HDL-C) are insulin resistance indexes routinely used in clinical and population-based studies; however, their short-term repeatability is not well characterized. Objective: To quantify the short-term repeatability of insulin resistance indexes and their analytes, consisting of fasting glucose and insulin for HOMA-IR and TG and HDL-C for TG/HDL-C. Design: Prospective cohort study. Participants: A total of 102 adults 68 to 88 years old without diabetes attended an initial examination and repeated examination (mean, 46 days; range, 28 to 102 days). Blood samples were collected, processed, shipped, and assayed following a standardized protocol. Main Outcome Measures: Repeatability was quantified using the intraclass correlation coefficient (ICC) and within-person coefficient of variation (CV). Minimum detectable change (MDC95) and minimum detectable difference with 95% confidence (MDD95) were quantified. Results: For HOMA-IR, insulin, and fasting glucose, the ICCs were 0.70, 0.68, and 0.70, respectively; their respective within-person CVs were 30.4%, 28.8%, and 5.6%. For TG/HDL-C, TG, and HDL-C, the ICCs were 0.80, 0.68, and 0.91, respectively; their respective within-person CVs were 23.0%, 20.6%, and 8.2%. The MDC95 was 2.3 for HOMA-IR and 1.4 for TG/HDL-C. The MDD95 for a sample of n = 100 was 0.8 for HOMA-IR and 0.6 for TG/HDL-C. Conclusions: Short-term repeatability was fair to good for HOMA-IR and excellent for TG/HDL-C according to suggested benchmarks, reflecting the short-term variability of their analytes. These measurement properties can inform the use of these indexes in clinical and population-based studies. |
DOI | 10.1210/jc.2017-02437 |
Alternate Journal | J Clin Endocrinol Metab |
PubMed ID | 29618016 |
PubMed Central ID | PMC6276677 |
Grant List | HHSN268201100012C / HL / NHLBI NIH HHS / United States HHSN268201100009I / HL / NHLBI NIH HHS / United States 2016097 / / Doris Duke Charitable Foundation / United States HHSN268201100010C / HL / NHLBI NIH HHS / United States HHSN268201100008C / HL / NHLBI NIH HHS / United States HHSN268201100007C / HL / NHLBI NIH HHS / United States HHSN268201100005G / HL / NHLBI NIH HHS / United States HHSN268201100008I / HL / NHLBI NIH HHS / United States R01 DK089174 / DK / NIDDK NIH HHS / United States HHSN268201100011C / HL / NHLBI NIH HHS / United States HHSN268201100006C / HL / NHLBI NIH HHS / United States HHSN268201100005I / HL / NHLBI NIH HHS / United States K24 DK106414 / DK / NIDDK NIH HHS / United States HHSN268201100009C / HL / NHLBI NIH HHS / United States HHSN268201100005C / HL / NHLBI NIH HHS / United States P30 DK116074 / DK / NIDDK NIH HHS / United States T32 HL007055 / HL / NHLBI NIH HHS / United States |