There are nine panels, each showing a scatter plot for a patient, numbered 1 to 9, all on the same scale. Each panel shows Observer 1, 2, and 3 on the horizontal axis and pupil diameter in millimetres by the Colvard method on the vertical axis. There are three clusters of points.
For Patient 1, Observer 3 appears to give lower readings than other observers.
For Patient 2, all observers appear to give similar readings.
For Patient 3, Observer 1 appears to give higher readings than other observers.
For Patient 4, Observer 1 appears to give higher readings than other observers.
For Patient 5, all observers appear to give similar readings.
For Patient 6, Observer 1 appears to give lower readings than other observers.
For Patient 7, all readings are low, Observer 3 appears to give lower readings than other observers.
For Patient 8, all observers appear to give similar readings.
For Patient 9, Observer 3 appears to give lower readings than other observers.
Back to Measurement in Health and Disease: Observer variation.
This page maintained by Martin Bland.
Last updated: 21 April, 2008.