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. Author manuscript; available in PMC: 2023 Apr 4.
Published in final edited form as: Psychol Med. 2021 Jul 29;53(4):1313–1322. doi: 10.1017/S003329172100283X

Figure 2.

Figure 2.

Bland-Altman plots comparing actigraphy and sleep diaries (left panel) and comparing actigraphy and the Pittsburgh Sleep Quality Index (PSQI; right panel) for total sleep time in SAD. The middle-dashed line indicates the means of the differences (in hours) between the 2 methods. The dashed lines above and below those means indicate the 95% limits of agreement (1.96 × the standard deviation of the mean difference). Positive values indicate greater total sleep time measured by actigraphy.