iglu (version 4.2.2)

gmi: Calculate GMI

Description

The function gmi produces GMI values in a tibble object.

Usage

gmi(data)

Value

If a data.frame object is passed, then a tibble object with two columns: subject id and corresponding GMI is returned. If a vector of glucose values is passed, then a tibble object with just the GMI value is returned. as.numeric() can be wrapped around the latter to output just a numeric value.

Arguments

data

DataFrame object with column names "id", "time", and "gl", or numeric vector of glucose values.

Details

A tibble object with 1 row for each subject, a column for subject id and a column for GMI values is returned. NA glucose values are omitted from the calculation of the GMI.

GMI score is calculated by \(3.31 + (.02392*mean(G))\) where G is the vector of Glucose Measurements (mg/dL).

References

Bergenstal (2018) Glucose Management Indicator (GMI): A New Term for Estimating A1C From Continuous Glucose Monitoring Hormone and Metabolic Research 41 .2275-2280, tools:::Rd_expr_doi("10.2337/dc18-1581").

Examples

data(example_data_1_subject)
gmi(example_data_1_subject)

data(example_data_5_subject)
gmi(example_data_5_subject)