You can read it that way, or that they report higher pain intensity, or that they have been refused medication in the past so are likely to exaggerate in order to get what they need.
The problem is we don't have an objective way to measure pain. We can control the stimulus, but is it possible that one person experiences pain differently from others. By aggregating data you can find trends among populations. Hiding this information doesn't serve anyone.
Knowing what groups tend to over/state pain is useful. The format they show it in is offensive, some straight up graphs and numbers showing what the trends are would be better.