Table 1.
Baseline characteristics of the study population stratified by category of obstructive sleep apnea (OSA).
| Variable | All (% or SD) | Normal-mild (% or SD) | Moderate (% or SD) | Severe (% or SD) | p value |
|---|---|---|---|---|---|
| (N = 249) | (N = 72) | (N = 72) | (N = 105) | ||
| Age (years) | 57.2 (12.5) | 56.4 (13.4) | 57 (11.8) | 57.8 (12.4) | 0.74 |
| Sex (female) | 125 (50.2%) | 49 (68%) | 35 (48.6%) | 41 (39.1%) | 0.0007 |
| Race | White 194 (77.9%) | 53 (73.6%) | 64 (88.9%) | 77 (73.3%) | |
| Black 47 (18.8%) | 17 (23.6%) | 7 (9.7%) | 23 (21.9%) | 0.1 | |
| Other 8 (3.2%) | 2 (2.8%) | 1 (1.4%) | 5 (4.8%) | ||
| Hypertension | 182 (73.1%) | 48 (66.7%) | 48 (66.7%) | 86 (89.9%) | 0.03 |
| HF | 50 (20.1%) | 13 (18.1%) | 12 (16.7%) | 25 (23.8%) | 0.45 |
| COPD | 40 (16.1%) | 20 (27.8%) | 9 (12.5%) | 11 (10.5%) | 0.005 |
| AF | 43 (17.3%) | 18 (25%) | 7 (9.7%) | 18 (17.1%) | 0.052 |
| BMI (kg/m2) | 37.2 (9.4) | 34.3 (8.7) | 36 (8) | 39.9 (10.1) | 0.0002 |
| AHI (/hr) | 35.3 (29.7) | 8.78 (3.79) | 21.18 (4.3) | 63.21 (25.93) | NA |
| Mean oxygen saturation (%) | 92.7 (3) | 93.6 (2.7) | 93.2 (2.3) | 91.6 (3.3) | <0.0001 |
| On AV blockades | 129 (52.2%) | 34 (48.6%) | 32 (44.4%) | 63 (60%) | 0.097 |
Values are means (SD) for continuous variables and percentages for dichotomous variables. Classification of apnea-hypopnea index (AHI): normal-mild: <15/hr, moderate: 15-30/hr, and severe: >30/hr. HF = heart failure; COPD = chronic obstructive pulmonary disease; AF = atrial fibrillation; BMI = body mass index; AV block = atrioventricular block; SD = standard deviation.