Results of multivariable negative binomial regressions examining the relationship between WHO pulmonary hypertension group and obstructive sleep apnoea severity
| All patients (N=132) | Polysomnography only (N=83) | |||||||
| Dependent variable: AHI-REI (events/hour) | Dependent variable: AHI (events/hour) | |||||||
| N | Rate ratio | 95% CI | P* | N | Rate ratio | 95% CI | P* | |
| WHO group I | 49 | 1 (Reference) | - | - | 37 | 1 (Reference) | - | - |
| WHO group II | 53 | 1.87 | (1.17 to 3.00) | <0.01 | 30 | 2.04 | (1.14 to 3.67) | 0.02 |
| WHO group III | 13 | 0.44 | (0.23 to 0.84) | 0.01 | 11 | 0.45 | (0.22 to 0.93) | 0.03 |
| WHO group IV | 13 | 1.48 | (0.79 to 2.79) | 0.22 | 5 | 2.61 | (1.06 to 6.39) | 0.04 |
| WHO group V | 4 | 1.19 | (0.31 to 4.47) | 0.80 | – | – | – | – |
| Age, years | 1.02 | (1.00 to 1.04) | 0.05 | 1.02 | (1.00 to 1.05) | 0.08 | ||
| Male gender | 1.92 | (1.21 to 3.03) | <0.01 | 1.44 | (0.71 to 2.90) | 0.31 | ||
| BMI, kg/m2 | 1.03 | (1.00 to 1.06) | 0.02 | 1.04 | (1.00 to 1.07) | 0.03 | ||
| Home sleep study | 0.70 | (0.46 to 1.07) | 0.10 | |||||
*P<0.05 was considered statistically significant. P-values <0.05 are indicated in boldface.
BMI, body mass index.