iglu (version 4.2.2)

lbgi: Calculate Low Blood Glucose Index (LBGI)

Description

The function lbgi produces LBGI values in a tibble object.

Usage

lbgi(data)

Value

If a data.frame object is passed, then a tibble object with two columns: subject id and corresponding LBGI value is returned. If a vector of glucose values is passed, then a tibble object with just the LBGI 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 LBGI values is returned. NA glucose values are omitted from the calculation of the LBGI.

LBGI is calculated by \(1/n * \sum (10 * fbg_i ^2)\), where \(fbg_i = min(0, 1.509 * (log(G_i)^{1.084} - 5.381)\), G_i is the ith Glucose measurement for a subject, and n is the total number of measurements for that subject.

References

Kovatchev et al. (2006) Evaluation of a New Measure of Blood Glucose Variability in, Diabetes Diabetes care 29 .2433-2438, tools:::Rd_expr_doi("10.2337/dc06-1085").

Examples

data(example_data_1_subject)
lbgi(example_data_1_subject)

data(example_data_5_subject)
lbgi(example_data_5_subject)