Table 1.
Baseline clinical characteristics of the study population according to positional category.
| All | NPOSA | POSA | P Value vs NPOSA | e-POSA | P Value vs NPOSA | |
|---|---|---|---|---|---|---|
| n | 6,437 | 2,996 | 3,441 | 1,293 | ||
| Time in supine position, % | 46.3 (22.6) | 45.3 (22.9) | 47.2 (22.3) | .0009 | 53.9 (21.9) | < .0001 |
| Age, years | 61.1 (13.3) | 62.8 (13.7) | 59.6 (12.8) | < .0001 | 57.4 (12.9) | < .0001 |
| Men, % | 66.2 | 63.7 | 68.4 | < .0001 | 64.2 | .7671 |
| BMI, kg/m2 | 30.7 (6.5) | 32.8 (6.9) | 28.9 (5.5) | < .0001 | 27.4 (5.5) | < .0001 |
| Obesity, % | 48.0 | 62.4 | 35.4 | < .0001 | 26.2 | < .0001 |
| ESS | 9.9 (5.1) | 9.9 (5.0) | 10.0 (5.1) | .4164 | 9.9 (5.1) | .6738 |
| ESS ≥ 11, % | 44.7 | 44.4 | 45.0 | .6606 | 44.2 | .9176 |
| QD2A score | 3.6 (3.4) | 3.7 (3.4) | 3.4 (3.4) | .0022 | 3.5 (3.4) | .0839 |
| QD2A score ≥ 7, % | 19.9 | 20.8 | 19.1 | .0967 | 19.5 | .3470 |
| SF36 MCS | 46.9 (5.6) | 46.8 (5.7) | 46.9 (5.5) | .2626 | 46.6 (5.5) | .3735 |
| SF36 PCS | 50.7 (2.2) | 50.6 (2.2) | 50.8 (2.1) | .0089 | 50.9 (2.2) | < .0001 |
| AHI | 29.4 (19.8) | 36.8 (22.7) | 23.0 (14.0) | < .0001 | 13.5 (8.6) | < .0001 |
| Supine AHI | 39.6 (23.9) | 39.3 (25.3) | 39.9 (22.7) | .2746 | 24.3 (15.0) | < .0001 |
| Nonsupine AHI | 21.5 (20.9) | 34.8 (22.8) | 9.9 (8.8) | < .0001 | 2.5 (1.3) | < .0001 |
| Hypertension, % | 35.5 | 41.6 | 30.1 | < .0001 | 25.3 | < .0001 |
| Diabetes, % | 14.8 | 19.2 | 10.9 | < .0001 | 8.0 | < .0001 |
| CV disease, % | 16.8 | 19.8 | 14.1 | < .0001 | 12.3 | < .0001 |
| PSG, % | 44.6 | 35.7 | 52.3 | < .0001 | 57.0 | < .0001 |
Data are expressed as mean (standard deviation) or percentages. P values are based on t tests for continuous variables and chi-square test for categorical variables. AHI = apnea-hypopnea index, BMI = body mass index, CV = cardiovascular, e-POSA = exclusive positional obstructive sleep apnea, ESS = Epworth Sleepiness Score, MCS = mental composite score, NPOSA = nonpositional obstructive sleep apnea, PCS = physical composite score, POSA = positional obstructive sleep apnea, PSG = polysomnography.