Introduction
Methods
Patients
Sleep study setup
Data summary
Disposable cut-to-fit RIP belts | Semi-disposable folding RIP belts | Disposable snap-on RIP belts | |
---|---|---|---|
Initial count | 254 | 225 | 288 |
Measurement duplicated | − 9 | − 13 | − 1 |
Missing signal | − 17 | − 24 | − 2 |
No patient information | − 13 | − 30 | − 22 |
Analysis period < 4 h | − 9 | − 9 | − 7 |
Final count | 206 | 149 | 256 |
Signal reliability
Signal quality
Results
The study cohort
Disposable cut-to-fit RIP belts (n = 206) | Semi-disposable folding RIP belts (n = 149) | Disposable snap-on RIP belts (n = 256) | p value* | |
---|---|---|---|---|
Demographic data | ||||
Age (years) | 50.0 ± 11.4 | 47.4 ± 12.4 | 48.5 ± 13.1 | 0.15 |
Female (%) | 31.1 | 26.2 | 33.6 | 0.30 |
BMI (kg/m2) | 29.8 ± 5.7 | 31.3 ± 5.6 | 31.9 ± 6.4 | 0.001 |
Sleep study | ||||
Analysis period (h) | 6.7 ± 1.0 | 6.9 ± 1.0 | 6.9 ± 1.9 | 0.12 |
AHI (events/h) | 14.1 ± 17.6 | 14.2 ± 19.3 | 13.6 ± 16.9 | 0.53 |
ODI (events/h) | 13.9 ± 17.3 | 12.3 ± 17.7 | 12.7 ± 16.4 | 0.04 |
Cannula and RIP belt reliability
Disposable cut-to-fit RIP belts (n = 206) | Semi-disposable folding RIP belts (n = 149) | Disposable snap-on RIP belts (n = 256) | p value overall comparison | |
---|---|---|---|---|
Cannula and RIP belt signal reliability | ||||
Median cannula (%) | 99.3 (93.9–100.0) | 98.8 (87.6–100.0) | 98.7 (83.2–100.0) | |
Mean cannula (%) | 92.5 ± 16.1 | 87.0 ± 23.3 | 85.5 ± 24.5 | 0.002 |
Median thorax (%) | 96.1 (77.8–100.0) | 85.4 (66.6–94.4) | 100.0 (99.7–100.0) | |
Mean thorax (%) | 83.0 ± 26.2 | 76.1 ± 24.4 | 98.5 ± 9.3 | < 0.001 |
Median abdomen (%) | 97.3 (71.2–97.3) | 90.2 (59.4–99.7) | 100.0 (99.7–100.0) | |
Mean abdomen (%) | 81.7 ± 26.8 | 72.7 ± 36.2 | 98.8 ± 8.9 | < 0.001 |
Calibrated RIP flow signal quality* | ||||
Median calibrated RIP flow (r) | 0.89 (0.73–0.94) | 0.54 (0.40–0.67) | 0.92 (0.84–0.96) | |
Mean calibrated RIP flow (r) | 0.79 ± 0.24 | 0.52 ± 0.20 | 0.86 ± 0.18 | < 0.001 |
% calibrated RIP flow > 0.8 (r) | 67.6% | 6.9% | 80.6% |