Table 2.
All jaw-closing muscle activity indices of the 18 patients with OSA without MAA in situ and with MAA in situ.
| Without MAAa | With MAAa | Testb | P * | |
|---|---|---|---|---|
| JCMA related to respiratory arousals (events/h) | ||||
| JCMA | 0.7|1.6|3.6 | 0.2|0.6|1.1 | Z = −3.434 | .001* |
| RMMA | 0.0|0.4|1.1 | 0.0|0.2|0.3 | Z = −2.135 | .033* |
| Orofacial activity | 0.4|1.1|2.3 | 0.0|0.3|0.6 | Z = −3.446 | .001* |
| Other muscle activity | 0.0|0.3|0.5 | 0.0|0.1|0.3 | Z = −1.938 | .053 |
| JCMA related to nonrespiratory arousals (events/h) | ||||
| JCMA | 1.2|1.8|4.5 | 0.4|1.7|3.8 | Z = − 0.663 | .507 |
| RMMA | 0.2|0.6|1.4 | 0.0|0.4|0.9 | Z = − 0.341 | .733 |
| Orofacial activity | 0.5|1.3|2.7 | 0.2|1.1|2.6 | Z = − 0.207 | .836 |
| Other muscle activity | 0.3|0.5|0.8 | 0.3|0.7|1.0 | Z = −1.093 | .275 |
| Total JCMA (events/h) | ||||
| JCMA | 2.4|5.5|8.1 | 1.1|2.7|5.1 | Z = −1.678 | .093 |
| RMMA | 0.2|1.2|3.3 | 0.0|0.6|2.2 | Z = −0.994 | .320 |
| Phasic episode | 0.0|0.3|1.3 | 0.0|0.1|0.7 | Z = −1.085 | .278 |
| Tonic episode | 0.0|0.2|0.7 | 0.0|0.2|0.6 | Z = −0.664 | .507 |
| Mixed episode | 0.0|0.0|0.3 | 0.0|0.0|0.3 | Z = −0.564 | .573 |
| Orofacial activity | 1.2|3.1|5.2 | 0.5|1.8|3.9 | Z = −1.656 | .098 |
| Other muscle activity | 0.4|0.7|1.5 | 0.5|1.0|1.3 | Z = 0.000 | 1.000 |
*
A P-value of < 0.05 is considered statistically significant. aThe 25%|median|75% percentiles are given for not normally distributed variables. bZ = Wilcoxon signed-rank test analysis. MAA = mandibular advancement appliance, OSA = obstructive sleep apnea, RMMA = rhythmic masticatory muscle activity (= phasic episode + tonic episode + mixed episode), JCMA = jaw-closing muscle activity (= RMMA + orofacial activity).