Graph description: Figure 4. Histogram of differences for PEFR data

This is a histogram showing the distribution of the difference in P E F R, Wright meter minus mini meter. The distribution is approximately symmetrical, with the modal class minus 20 to 0. The lowest class is minus 100 to minus 80, with one observation. The highest class is 60 to 80, with two observations.

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Last updated: 29 April, 2008.