Usefulness of SPISE Index for Screening and Detection of Early Stages of Insulin Resistance among Chilean Young Adults.

Background: As the gold standard test to quantify insulin resistance (IR) involves intravenous insulin loading and repeated blood glucose monitoring, many indexes have been developed for IR assessment for convenience.

Objective: The objective of this study was to evaluate the agreement of the Single-Point Insulin Sensitivity Estimator (SPISE) by comparing it with the homeostasis model assessment of insulin resistance (HOMA-IR) in identifying IR.

Method: Data came from the ongoing LIMACHE BIRTH COHORT. 1,948 individuals (aged 22-28 years) were studied. We performed an agreement plot called a Bangdiwala's Observer Agreement to evaluate patterns in departures from agreement in ordinal categorical variables.

Results: According to the Bangdiwala-Weighted statistics, we found that the agreement between both indexes was 0.14; this value would be considered a slight agreement. Thus, we found bias in the marginal distributions, and we noticed that the SPISE has a bias toward the central quintiles of the index.

Conclusions: The identification of IR in young adult individuals by the SPISE index has slight agreement with HOMA-IR. Therefore, caution would be taken when considering SPISE index among young Chilean adults.