glucose {MethComp}

Glucose measurements by different methods

Description

74 persons in 5 centres in Finland had blood glucose measured by 11 different methods, based on 4 different types of blood. Each person had blood sampled at 0, 30, 60 and 120 min after a 75 g glucose load.

Format

A data frame with 1302 observations on the following 6 variables.

meth

Method of measurement. A factor with 11 levels: n.plas1 n.plas2 h.cap h.blood h.plas h.serum m.plas m.serum o.cap s.serum k.plas.

type

Type of blood sample. A factor with 4 levels: blood plasma serum capil

item

Person id.

time

Time of blood sampling. Minutes since glucose load.

cent

Center of sampling. Except for the two first methods, n.plas1 and n.plas2, samples were analyzed at the centres too

y

Glucose measurement in mmol/l.

Source

The study was conducted at the National Public Health Institute in Helsinki by Jaana Lindstrom.

References

B Carstensen, J Lindstrom, J Sundvall, K Borch-Johnsen1, J Tuomilehto & the DPS Study Group: Measurement of Blood Glucose: Comparison between different Types of Specimens. Annals of Clinical Biochemistry, to appear.

Examples

  data( glucose )
  str( glucose )
  # Use only plasma and serum as methods and make a Bland-Altman plot
  gluc <- subset( glucose, type %in% c("plasma","serum") )
  gluc$meth <- gluc$type
  gluc$repl <- gluc$time
  BA.plot( gluc )