Methods From January to December 2018, 600 elderly pregnant women[(36.4±1.2) years old]admitted to West China Second University Hospital, Sichuan University were included into elderly group, including 200 GDM and 400 non-GDM pregnant women. According to 1∶1 ratio, 600 ultra-elderly pregnant women (200 GDM and 400 non-GDM pregnant women) who visited the same hospital during the same period were enrolled into ultra-elderly group, with the age of (40.9±1.2) years old. Independent-samples t test was used to compare the age between two groups, and the proportion of different types of PE was analyzed by chi-square test. Univariate and multivariate logistic regression models were used to analyze the relationship between GDM elderly pregnant women and different types of PE. This study was in line with the requirements of World Medical Association Declaration of Helsinki revised in 2013.
Results ①The proportions of PE, early-onset PE and severe PE in GDM pregnant women were higher than those in non-GDM pregnant women in both elderly group and ultra-elderly group.Among them, the proportion of GDM pregnant women complicated with PE in the elderly group was higher than that of non-GDM pregnant women, with statistically significant (P<0.05). The proportion of early-onset PE and severe PE in GDM pregnant women in the ultra-elderly group were higher than those of non-GDM pregnant women, with statistically significant (P<0.05). ② Univariate logistic regression analysis showed that GDM was a risk factor for PE of elderly group (OR=2.232, 95%CI: 1.080-4.613, P=0.030). As for ultra-elderly age group, GDM was a risk factor for early-onset PE (OR=3.456, 95%CI: 1.238-9.650, P=0.018) and severe PE (OR=2.236, 95%CI: 1.057-4.729, P=0.035). ③After controlling for confounding factors, multivariate unconditional logistic regression analysis showed that the risk of PE in GDM pregnant women was 1.934 times than that in non-GDM pregnant women (OR=1.934, 95%CI: 1.029-4.115, P=0.047). In addition, BMI≥24 kg/m2 was a risk factor for PE(OR=2.931, 95%CI: 1.332-6.449, P=0.008), early-onset PE(OR=2.977, 95%CI: 1.105-8.019, P=0.031) and severe PE (OR=2.638, 95%CI: 1.093-6.365, P=0.031). Living in rural areas was a risk factor for PE (OR=2.831, 95%CI: 1.042-7.686, P=0.041) and severe PE (OR=3.232, 95%CI: 1.088-9.603, P=0.035). High education level was a protective factor for PE (OR=0.231, 95%CI: 0.071-0.749, P=0.015) and severe PE (OR=0.179, 95%CI: 0.048-0.673, P=0.011). In ultra-elderly group, the risk of early-onset PE and severe PE of pregnant women with GDM increased by 3.187 times (OR=3.187, 95%CI: 1.109-9.153, P=0.031) and 2.351 times (OR=2.351, 95%CI: 1.043-5.302, P=0.039), respectively, compared with those without GDM. In addition, BMI≥24 kg/m2 was a risk factor for PE(OR=2.654, 95%CI: 1.417-4.971, P=0.002) and severe PE (OR=3.418, 95%CI: 1.515-7.710, P=0.003). Living in suburban counties was a risk factor for PE (OR=2.374, 95%CI: 1.089-5.171, P=0.030) and severe PE (OR=5.303, 95%CI: 2.074-13.565, P<0.001). High education level was a protective factor for PE (OR=0.347, 95%CI: 0.135-0.892, P=0.028) and severe PE (OR=0.164, 95%CI: 0.047-0.574, P=0.005).