Table 1.
Sample characteristics (N = 48), Mean (± SD).
| Variables | Normal Subjects (AHI < 10, N = 8) | Apneic Subjects (AHI ≥ 10, N = 40) | p value |
|---|---|---|---|
| Demographic Variables | |||
| Gender | |||
| Male | 4 | 35 | 0.031* |
| Female | 4 | 5 | |
| Race | |||
| White | 5 | 35 | 0.116 |
| Black | 3 | 5 | |
| Age (years) | 49.50 (9.23) | 49.15 (9.51) | 0.924 |
| BMI (kg/m2) | 28.68 (5.26) | 29.85 (5.56) | 0.734 |
| Education (years)a | 14.83 (4.02) | 15.72 (2.46) | 0.619 |
| Sleep Variables | |||
| AHI (events/h) | 5.19 (3.05) | 32.87 (21.16) | < 0.001* |
| ODI (events/h) | 3.59 (2.24) | 21.88 (22.59) | < 0.001* |
| Average Oxygen Saturation | 95.00 (1.29) | 92.03 (15.12) | 0.596 |
| Sleep Stage (%) | |||
| Stage 1 | 8.08 (2.55) | 13.68 (9.39) | 0.040* |
| Stage 2 | 57.58 (4.91) | 55.17 (10.69) | 0.331 |
| Slow Wave Sleep | 8.68 (7.33) | 12.13 (10.69) | 0.523 |
| REM | 25.69 (5.54) | 19.03 (6.65) | 0.011* |
| PVT Variables | |||
| Count of Lapses (Response Time > 500 msec) | 2.63 (3.46) | 1.75 (2.46) | 0.615 |
| Average Response Time (msec) | 288.01 (52.33) | 264.78 (42.85) | 0.213 |
| Psychological Variables | |||
| CES-D | 12.50 (8.02) | 11.23 (9.14) | 0.523 |
| Marlowe-Crowne Social Desirability Scaleb | 21.50 (5.63) | 18.18 (6.58) | 0.283 |
| MFSI (Short Form) Total | −3.63 (8.02) | 7.45 (16.74) | 0.076 |
| MFSI (Short Form) Subscales | |||
| General Fatigue | 4.00 (3.74) | 8.00 (6.23) | 0.107 |
| Physical Fatigue | 2.63 (1.51) | 3.53 (3.71) | 0.946 |
| Emotional Fatigue | 2.38 (2.56) | 3.85 (3.73) | 0.268 |
| Mental Fatigue | 2.25 (1.83) | 4.60 (3.56) | 0.069 |
| Vigor | 14.88 (3.68) | 12.53 (4.59) | 0.107 |
OSA, obstructive sleep apnea; BMI, body mass index; AHI, apnea hypopnea index; ODI, oxygen desaturation index; REM, rapid eye movement sleep; CES-D, Center for Epidemiologic Studies Depression Scale; MFSI, Multidimensional Fatigue Symptom Inventory
a
N = 42;
b
N = 46;
*
p < 0.05