Resumen de Precision of the iDXA for Visceral Adipose Tissue Measurement in Severely Obese Patients.
Tamara E. Carver, Ross E. Andersen, Olivier Court, Nicolas V. Christou, Ryan E.R. Reid
AB A new measurement tool, the automated software CoreScan, for the GE Lunar iDXA, has been validated for measuring visceral adipose tissue (VAT) against computed tomography in normal-weight populations. However, no study has evaluated the precision of CoreScan in measuring VAT among severely obese patients. Purpose: The purpose of the study was to evaluate the precision of CoreScan for VAT measurements in severely obese adults (body mass index > 40 kg[middle dot]m-2). Methods: A total of 55 obese participants with a mean age of 46 +/- 11 yr, body mass index of 49 +/- 6 kg[middle dot]m-2, and body mass of 137.3 +/- 21.3 kg took part in this study. Two consecutive iDXA scans with repositioning of the total body were conducted for each participant. The coefficient of variation, the root-mean-square averages of SD of repeated measurements, the corresponding 95% least significant change, and intraclass correlations were calculated. Results: Precision error was 8.77% (percent coefficient of variation), with a root-mean-square SD of 0.294 kg and an intraclass correlation of 0.96. Bland-Altman plots demonstrated a mean precision bias of -0.08 +/- 0.41 kg, giving a coefficient of repeatability of 0.82 kg and a bias range of -0.890 to 0.725 kg. Conclusions: When interpreting VAT results with the iDXA in severely obese populations, clinicians should be aware of the precision error for this important clinical parameter.
