Graph description: Figure 5. Oxygen saturation monitor and pulsed saturation oximeter

This is a scatter diagram, showing average of O S M and P O S on the horizontal axis and the difference, P O S minus O S M, on the vertical axis. The horizontal scale is labeled 70, 80, 90, 100. The vertical scale is labeled minus 3, minus 2, minus 1, 0, 2, and 3. There is no attempt to make the two scales equal.

There are three horizontal lines on the graph, approximately through minus 2.8, minus 0.4, and 2.0. The lowest line is labeled mean minus 2 S D, the middle line is labeled mean, the highest line is labeled mean plus 2 S D.

The points form a horizontal cloud with the centre at about 88 horizontally and minus 0.4 vertically. Points are dense in the region horizontal scale 95 to 100. There is one point outside the top and bottom lines at about average = 75, difference = 2.5.

Back to Measurement in Health and Disease: Assessing Agreement Between Methods Of Clinical Measurement.

This page maintained by Martin Bland.
Last updated: 29 April, 2008.