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. Author manuscript; available in PMC: 2011 May 12.
Published in final edited form as: J Stat Softw. 2011 Mar 1;39(8):1–30. doi: 10.18637/jss.v039.i08

Figure 1.

Figure 1

Trait distributions – younger (< 65) vs. older (65 and up). Note: This graph shows smoothed histograms of the anxiety levels of older (dashed line) and younger (solid line) study participants as measured by the PROMIS Anxiety scale (theta). There is broad overlap in the distributions, though older individuals in general demonstrated lower levels of anxiety than younger individuals.