Suggested answer to exercise: Nasal diamorphine, 4

Question 4: How could the graph be improved?

Suggested answer

What we want to see is the proportions showing each reaction:

This shows much more clearly that about 20% of the intramuscular group screamed and none of the nasal group. If we want a cumulative graph, which I don’t think we do, we should start with screamed, then screamed or cried, then screamed or cried or winced, etc.:

Now the third pair of bars show the percentage who winced or worse.

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Last updated: 20 October, 2006.