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. Author manuscript; available in PMC: 2013 Mar 12.
Published in final edited form as: J Sleep Res. 2009 Mar 12;18(2):221–228. doi: 10.1111/j.1365-2869.2008.00713.x

Figure 2.

Figure 2

Per cent stage 1 sleep (log transformed) (top) and per cent slow wave sleep (bottom) of men and women, aged 20–88 years, in the Penn State Cohort in men and women who had no sleep complaints.