Table 3.
Generalized linear model investigating the association between apnea hypopnea index and arterial bicarbonate quartiles controlled for confounding factors
| Beta value | Standard error | 95% confidence interval | P-value | |
|---|---|---|---|---|
| Male sex | 8.28 | 3.03 | 2.35 – 14.21 | 0.006 |
| Age (years) | 0.12 | 0.08 | –0.05 – 0.28 | n.s. |
| Body mass index (kg/m2) | 1.45 | 0.16 | 1.14 – 1.76 | <0.001 |
| Smoking | 4.37 | 1.71 | 1.03 – 7.72 | 0.01 |
| Alcohol | 2.00 | 1.58 | –1.11 – 5.10 | n.s. |
| Hypertension | 4.89 | 1.54 | 1.86 – 7.92 | 0.002 |
| PO2 (kPa) | –0.36 | 0.10 | –0.57 – -0.16 | 0.001 |
| PCO2 (kPa) | –0.52 | 0.38 | –1.27 – 0.23 | n.s. |
| StHCO3 - Q2 vs. Q1 | 4.76 | 2.29 | 0.27 – 9.25 | 0.038 |
| StHCO3 - Q3 vs. Q1 | 4.34 | 2.67 | –0.90 – 9.57 | n.s. |
| StHCO3 - Q4 vs. Q1 | 10.63 | 3.00 | 4.76 – 16.51 | <0.001 |