Factors Affecting Visible Contamination of Positive Airway Pressure Devices in Patients With Obstructive Sleep Apnea.

In the interior main body model, the total duration of usage showed a near-significant trend ( P =0.061), but this did not reach the conventional threshold for significance ( R 2 =0.044).

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In the subgroup analysis ( Supplementary Table 2 ), mask contamination showed a trend toward significance with duration of usage for ≤12 months ( P =0.063, R 2 =0.064), while both duration of usage ( P =0.044) and average daily CPAP use ( P =0.021) were significant for masks used >12 months ( R 2 =0.285).

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In the subgroup analysis ( Supplementary Table 2 ), mask contamination showed a trend toward significance with duration of usage for ≤12 months ( P =0.063, R 2 =0.064), while both duration of usage ( P =0.044) and average daily CPAP use ( P =0.021) were significant for masks used >12 months ( R 2 =0.285).

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Although the sample size was larger than in previous studies, it may still be insufficient to draw definitive clinical conclusions, as some variables only showed borderline significance ( Supplementary Table 2 ).

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