Table 4.
Regression models for estimating risk factors of developing GDM
| Variables | Beta | RR | 95% Confidence interval | p-value |
|---|---|---|---|---|
| Regression model no. 1 | ||||
| 20-24 wks | ||||
| BMI | 0.118 | - | - | 0.089 |
| Age | 0.559 | - | - | 0.345 |
| BP2† | 3.733 | - | - | 0.001 |
| HbA1C1 | 4.167 | - | - | <0.001 |
| 24-28 wks | ||||
| BMI | 0.184 | - | - | 0.003 |
| Age | 0.60 | - | - | 0.242 |
| BP2 | 1.689 | - | - | 0.019 |
| HbA1C1 | 2.25 | - | - | <0.001 |
| Logistic regression no. 2 | ||||
| 20-24 wks | ||||
| BMI≥27 | 3.4 | 1.23-9.49 | 0.018 | |
| age≥25 | 1.7 | 0.54-5.62 | 0.34 | |
| BP2≥140/90 | 37.1 | 3.56-387.4 | 0.002 | |
| HbA1C1≥5.3% | 56.6 | 6.95-462.3 | 0.001 | |
| 24-28 wks | ||||
| BMI≥27 | 5.92 | 2.3-15.26 | 0.001 | |
| age≥25 | 1.18 | 0.65-5.03 | 0.25 | |
| BP2≥140/90 | 4.75 | 1.08-20.82 | 0.039 | |
| HbA1C1≥5.3% | 9.1 | 3.38-24.64 | 0.001 |
RR: relative risk; BMI: body mass index; BP: blood pressure: HbA1C: hemoglobin A1C
*
Two regression models have been introduced. The first represent independent variables as quantitative data and in the second model values have been redefined according to appropriate cut-off values obtained both in the study and from previous studies.
†
Numbers indicate time of measurements as followed: BP2 as BP measured during 20-24 weeks of gestation; HbA1C1 as measured during 20-24 weeks of gestation.