Table 2.
Comparison of participants based on apnea or hypopnea predominance.
| Apnea-Predominant (n = 221) | Hypopnea-Predominant (n = 279) | P | |
|---|---|---|---|
| Age, y | 52.2 (14.4) | 52.5 (13.6) | .794 |
| Sex | .001 | ||
| Female | 72 (32.6%) | 132 (47.3%) | |
| Male | 149 (67.4%) | 147 (52.7%) | |
| BMI, kg/m2 | 34.4 (7.92) | 37.7 (9.25) | < .001 |
| Neck, cm* | 42.5 (5.16) | 41.7 (4.14) | .151 |
| AHI, events/h | 45.0 (27.8) | 30.6 (22.8) | < .001 |
| REM sleep AHI, events/h** | 52.6 (30.9) | 47.1 (27.8) | .193 |
| Positional apnea*** | 1.000 | ||
| Nonpositional | 62 (45.3%) | 68 (45.3%) | |
| Positional | 75 (54.7%) | 82 (54.7%) | |
| ODI, events/h | 39.1 (28.7) | 28.9 (22.0) | < .001 |
| O2 nadir, % | 75.2 (9.28) | 77.6 (7.88) | .002 |
| Mean pressure, cm H2O | 9.01 (2.54) | 8.36 (2.14) | .002 |
| Pressure > 90% time, cm H2O | 11.4 (2.89) | 10.7 (2.60) | .004 |
| Peak pressure, cm H2O | 12.5 (3.13) | 12.0 (2.78) | .039 |
| Mask type**** | .794 | ||
| Full-face mask | 118 (53.4%) | 143 (51.8%) | |
| Nasal mask | 103 (46.6%) | 133 (48.2%) | |
| Study type | .001 | ||
| 1 | 127 (57.5%) | 121 (43.4%) | |
| 2 | 49 (22.2%) | 106 (38.0%) | |
| 3 | 45 (20.4%) | 52 (18.6%) |
Categorical data are reported as counts with percent of the total sample in parenthesis, numerical data are reported as mean values with standard deviation in parenthesis. *Neck circumference data were not available in all participants (n = 129, n = 168 for apnea-predominant and hypopnea-predominant participants, respectively). **REM sleep data only present among full polysomnograms (n = 80, n = 137 for apnea-predominant and hypopnea-predominant participants, respectively). ***Sleep position data not available in all participants (n = 137, n = 150 for apnea-predominant and hypopnea-predominant participants, respectively). ****One hypopnea-predominant participant had an unknown mask type. AHI = apnea-hypopnea index, BMI = body mass index, ODI = oxygen desaturation index, REM = rapid eye movement.