Table 2.
Variables independently related to changes in the apnea–hypopnea index and minimum SaO2 in the multiple regression analysis (stepwise method).
| β | Beta 95% CI | p | |
|---|---|---|---|
| ∆ AHI | |||
| Baseline AHI (events/hour) | −0.614 | −0.443 (−0.630 to −0.256) | <0.001 |
| ∆ HbA1c (%) | 0.453 | 6.565 (2.814 to 10.315) | 0.001 |
| Baseline HbA1c (%) | −0.189 | - | 0.193 |
| Baseline BMI | 0.058 | - | 0.448 |
| Age (yrs) | 0.057 | - | 0.677 |
| Smoking status * | 0.033 | - | 0.811 |
| ∆ BMI (kg/m2) | −0.023 | - | 0.865 |
| Known type 2 diabetes duration (yrs) | −0.015 | - | 0.915 |
| Gender | 0.009 | - | 0.949 |
| Constant | - | 15.197 (6.403 to 23.991) | 0.001 |
| R2 = 0.496 | |||
| ∆ mínimum SaO2 | |||
| Baseline HbA1c (%) | 0.360 | 2.378 (0.116 to 4.639) | 0.040 |
| Baseline AHI (events/hour) | −0.355 | −0.118 (−0.232 to −0.004) | 0.043 |
| Gender | −0.224 | - | 0.241 |
| Age (yrs) | −0.166 | - | 0.367 |
| ∆ AHI | −0.166 | - | 0.406 |
| Known type 2 diabetes duration (yrs) | −0.150 | - | 0.427 |
| Smoking status * | −0.124 | - | 0.504 |
| ∆ HbA1c (%) | −0.134 | - | 0.535 |
| ∆ BMI (kg/m2) | −0.059 | - | 0.735 |
| Baseline BMI | 0.031 | - | 0.860 |
| Constant | - | −17.386 (−38.175 to 3.403) | 0.097 |
| R2 = 0.288 |
β: standardized coefficient; Beta: non-standardized coefficient; ∆: absolute change; AHI: apnea–hypopnea index; HbA1c: glycated hemoglobin; SaO2: arterial oxygen saturation; BMI: body mass index; CI: confidence interval. * never smokers vs. former and past smokers.