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. 2015 Dec 11;5:18188. doi: 10.1038/srep18188

Figure 1. Changes in the main variables of interest induced by the switch from a regular pillow to a head-positioning pillow (HPP).

Figure 1

(A) In the entire study cohort, the use of a HPP caused a significant increase in the minimal arterial oxygen saturation. (B) In normal-weight patients, the use of a HPP resulted in a decreased total sleep time. (C) In the entire study cohort, the use of a HPP caused a significant reduction in the severity of snoring. (D) Both in the entire study cohort and in normal-weight patients, the use of a HPP results in a significant reduction of the snoring index.