Graph description: Figure 13. Mean of one-week diary peak expiratory flow six months after training by an asthma specialist nurse or usual care (data of Levy et al., 2000)

This is a scatter diagram.

The horizontal axis shows Groups and is labeled Intervention and Control. The vertical axis shows Mean peak expiratory flow after six months in litres per minute and is numbered 0, 200, 400, 600, 800.

There are two columns of points. For intervention the column is from peak flow = 120 to 610. For control the column is from peak flow = 110 to 630. It is difficult to discern any difference in mean between the two groups.

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This page maintained by Martin Bland.
Last updated 27 July, 2009.