Table 2.
Univariate Analysis Between Hypertension and Demographic, Respiratory, and Sleep Apnea Characteristics
| Hypertensive Patients | Normotensive Patients | Hypertension P Value | |
|---|---|---|---|
| Age, y | 57.2±11.2 | 45.8±15.8 | <.0001 |
| BMI, kg/m2 | 33.3±6.3 | 30.3±5.8 | <.0001 |
| CCI | 1.8±2 | 0.5±1.1 | <.0001 |
| ESS | 10.1±9.9 | 8.5±4.9 | <.0001 |
| FEV1, % | 86.3±18.5 | 95.9±41.5 | <.0001 |
| FVC, % | 87.1±16.6 | 96.3±15.1 | <.0001 |
| FEV1/FVC | 79.9±8.3 | 81.2±6.2 | .003 |
| Daytime SaO2, % | 96.6±2 | 97.5±1.6 | <.0001 |
| Mean SaO2, % | 87.7±5.5 | 89.2±5.3 | <.0001 |
| Minimum SaO2, % | 75.5±11.8 | 80.2±11.1 | <.0001 |
| REM mean SaO2, % | 89.8±5.7 | 92.3±6.2 | <.0001 |
| NREM mean SaO2, % | 93.3±39.8 | 93±3.1 | .848 |
| DI | 42±29.3 | 32.1±31.5 | <.0001 |
| AHI | 36.5±26.6 | 28.7±28.6 | <.0001 |
| Apneas/h | 14.4±18 | 12.2±18.5 | .023 |
| Hypopneas/h | 22.3±17.9 | 17.3±17.3 | <.0001 |
| AI | 39.7±36.2 | 35.4±24.4 | .019 |
Abbreviations: AHI, apnea‐hypopnea index; AI, arousal index; apneas/h, number of apneas per hour of total sleep time; BMI, body mass index; CCI, Charlson Comorbidity Index; daytime SaO2, daytime mean oxygen saturation; DI, desaturation index; ESS, Epworth Sleepiness Scale; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; hypopneas/h, number of hypopneas per hour of total sleep time; mean SaO2, mean oxygen saturation during respiratory events; minimum SaO2, minimum oxygen saturation during sleep; NREM mean SaO2, mean oxygen saturation during non‐rapid eye movement sleep, REM mean SaO2, mean saturation during rapid eye movement sleep. Values are expressed as mean±standard deviation. Spirometry data were available for approximately 938 of 1227 patients and analyzed with independent samples t test.