Table 2.
Relative risk ratio (RRR)a of patient characteristics at the first pregnancy to predict risk of gestational diabetes (GDM) only in the first pregnancy, only in the second pregnancy, and in both pregnancies
| Occurrence of gestational diabetes | ||||||
|---|---|---|---|---|---|---|
| Only 1st pregnancyb (GDM+/−) N = 113 |
Only 2nd pregnancyb (GDM−/+) N = 223 |
Both pregnanciesb (GDM+/+) N = 191 |
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| RRR (95% CI) | p value | RRR (95% CI) | p value | RRR (95% CI) | p value | |
| Age | 1.03 (0.98–1.09) | 0.21 | 1.06 (1.02–1.10) | 0.004 | 1.07 (1.03–1.12) | < 0.001 |
| Cohabiting | 1.18 (0.69–2.03) | 0.54 | 1.57 (1.02–2.44) | 0.041 | 0.90 (0.59–1.38) | 0.64 |
| Smoking | 1.40 (0.86–2.46) | 0.17 | 1.40 (0.94–2.08) | 0.98 | 1.24 (0.79–1.96) | 0.35 |
| Years of schooling | 0.93 (0.85–1.03) | 0.12 | 0.92 (0.86–0.99) | 0.016 | 0.95 (0.89–1.03) | 0.22 |
| BMI (kg/m2) | 1.12 (1.07–1.16) | < 0.001 | 1.12 (1.08–1.15) | < 0.001 | 1.21 (1.17–1.24) | < 0.001 |
| Any fertility treatment | 2.34 (1.31–4.18) | 0.004 | 1.25 (0.74–2.10) | 0.40 | 2.04 (1.24–3.34) | 0.005 |
| Hypertensive disorderc | – | – | 0.83 (0.43–1.59) | 0.57 | 1.75 (1.02–3.02) | 0.043 |
aMultinominal logistic regression model was used to assess the RRR
bWomen having GDM in neither pregnancy (GDM−/−; n = 1820) are the reference group for the model
cHypertensive disorder in the first pregnancy (antenatal hospitalization with ICD-10 codes O10, O13, and O14)