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Table 4 Annual prevalence of gestational diabetes mellitus, 2016–2018

From: Trends in prevalence of gestational diabetes mellitus in Zhejiang Province, China, 2016–2018

Characteristic

2016

2017

2018

Overall

 Mean age at diagnosis (SD), year

30.89 (4.74)

31.59 (4.94)

31.61 (4.85)

 Number of cases

30,821

33,399

32,843

 Number of births

330,089

323,845

315,318

 Prevalence (%)

9.34

10.31

10.42

 Standardized prevalencea (%)

6.02

7.98

7.94

Urban areas

 Number of cases

16,427

16,267

15,831

 Number of births

109,054

107,029

105,110

 Prevalence (%)

15.06

15.20

15.06

 Standardized prevalencea (%)

8.24

9.66

9.50

Rural areas

 Number of cases

14,394

17,132

17,012

 Number of births

212,430

208,406

201,770

 Prevalence (%)

6.78

8.22

8.43

 Standardized prevalencea (%)

4.81

7.01

6.94

Urban areas (%)

 20–24 years

5.16

4.71

3.90

 25–29 years

12.70

11.43

11.26

 30–34 years

21.09

19.91

20.58

 35–39 years

30.57

36.04

32.30

 40–44 years

18.16

29.36

29.79

 45–50 years

2.82

2.87

5.07

Rural areas (%)

 20–24 years

1.90

1.94

2.00

 25–29 years

6.08

6.41

6.53

 30–34 years

11.17

13.49

14.26

 35–39 years

16.21

22.80

21.76

 40–44 years

13.70

26.35

24.74

 45–50 years

3.29

4.11

5.46

  1. aAge-standardized to the 6th population census in Zhejiang province, 2010