This observational study is being undertaken as a part of a Master of Research (MRes) in Clinical Research programme. Its goal is to learn about how continuous positive airway pressure (CPAP) therapy changes the complexity of body signals in adults with obstructive sleep apnoea (OSA). The main question it aims to answer is: \- How does the complexity of physiological signals (specifically oxygen saturation, heart rate variability, and airflow) change in adults with OSA from before to after three and six months of CPAP treatment? It will use data from individuals who took part in an earlier trial, called 3DPiPPIn, which tested the use of 3D-printed, customised masks CPAP masks through sleep studies.
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Change in oxygen saturation entropy from pre to six months post CPAP therapy
Timeframe: From baseline to six months post-initiation of CPAP therapy
Change in heart rate variability entropy from pre to six months post CPAP therapy
Timeframe: From baseline to six months post-initiation of CPAP therapy
Change in airflow entropy from pre to six months post CPAP therapy
Timeframe: From baseline to six months post-initiation of CPAP therapy