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. Author manuscript; available in PMC: 2018 Jun 8.
Published in final edited form as: J Pain. 2016 Dec 18;18(4):428–436. doi: 10.1016/j.jpain.2016.12.003

Figure 2.

Figure 2

The positive association between poor sleep quality (higher X-axis scores on the PSQI) and perceived stress persisted throughout follow-up. Values on the Y axis are mean (95% confidence limits) PSS scores. The 3 plotted series are data from baseline, at first Quarterly Health Update, and final Quarterly Health Update. The dotted vertical line at the value “5” on the X axis indicates the threshold for poor sleep quality.