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7van Maanen et al, Long-Term Effectiveness and Compliance of Positional Therapy with the Sleep Position Trainer in the Treatment of Positional Obstructive Sleep Apnea Syndrome, 2014
833% increase in PSQI score in 145 men (6 months). The Pittsburgh Sleep Quality Index: A New Instrument for Psychiatric Practice and Research, Buysse 1998; Validation of the Pittsburgh Sleep Quality Index (PSQI) and the Epworth Sleepiness Scale in Older Black and White Women Beaudreau, 2012
9Dutch Apnea Society (Apneuvereniging) survey based on 75 NightBalance users for an average of 2.2 years; 2017
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