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. Author manuscript; available in PMC: 2022 Nov 28.
Published in final edited form as: Sleep Med Rev. 2019 Nov 29;50:101247. doi: 10.1016/j.smrv.2019.101247

Fig. 2.

Fig. 2.

Risk of bias scores, including internal and external validity, across napping studies. Note. Red = high risk (≥7); Blue = moderate risk (4–6); Green = low risk (≤3). External validity scores range 0–4; internal validity scores range 0–6; total range 0–10. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)