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Table 3 Prevalence rate ratios (PRR) of gestational diabetes mellitus in relation to calendar year and demographic factors

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

Characteristic

Urban

Rural

All

PRR

95% CI

PRR

95% CI

PRR

95% CI

Year

 2016

Ref

 

Ref

 

Ref

 

 2017

0.99

0.97–1.02

1.21

1.18–1.23

1.09

1.08–1.11

 2018

0.97

0.95–0.99

1.22

1.20–1.25

1.09

1.07–1.10

Age

 20–24 years

Ref

 

Ref

 

Ref

 

 25–29 years

2.57

2.46–2.67

3.26

3.14–3.38

3.00

2.92–3.08

 30–34 years

4.46

4.28–4.64

6.66

6.42–6.91

5.64

5.49–5.80

 35–39 years

7.16

6.86–7.48

10.39

10.00–10.80

8.95

8.69–9.20

 40–44 years

5.58

5.28–5.89

11.04

10.51–11.60

8.14

7.85–8.44

 45–50 years

0.78

0.65–0.93

2.20

1.90–2.55

1.37

1.22–1.54

Residence area

 Urban

    

1.69

1.67–1.72

 Rural

    

Ref

 
  1. PRR prevalence rate ratios, CI confidence interval, Ref. reference
  2. Multivariable Poisson regression model with the calendar year as a dummy variable