Table 4.
Multivariable analysis of reduction in genioglossus activity during events
| Independent Variable | Reduction in EMGgg |
|
|---|---|---|
| %baseline | %max | |
| Reduction in drive | 17.8 (8.7 to 26.8) P = 0.0003 |
2.7 (1.6 to 3.7) P = 8 × 10−6 |
| Reduction in pressure | −3.0 (−11.6 to 5.5) P = 0.5 |
−0.4 (−1.4 to 0.6) P = 0.4 |
| Drive-vs.-pressure contribution (βdrive:βpressure) | 12.9 (4.8 to 21.0) P = 0.003 |
1.8 (0.9 to 2.8) P = 0.0003 |
Definition of abbreviations: %max = percentage maximum; EMGgg = genioglossus activity; SD = standard deviation.
Reduction in EMGgg was regressed against the reduction in drive, the reduction in pressure, and the drive-versus-pressure contribution (βdrive:βpressure, transformed). Independent variables were 1-SD standardized and to facilitate comparisons. Reduction in EMGgg, drive, and pressure were all calculated at nadir ventilation. Model R2 = 0.32 (left) and 0.43 (right).