Gestational diabetes & diabetes in pregnancy

Socioeconomic status, maternal risk factors, and gestational diabetes mellitus across reproductive years: a Finnish register-based study

BMJ Open Diabetes Res CarePublished Register-based cohort study

Authors' conclusion

There is a paradox that socioeconomic advantage increases the incidence of GDM at the population level while reducing the incidence of GDM within the population. Nevertheless, socioeconomic differences in GDM persist and widen with increasing maternal age, even after accounting for maternal risk factors.

Study context

Population
Women who gave birth in Finland 2008–2015, Finnish Medical Birth Register and Statistics Finland
Participants
474,166 women
Exposure
Socioeconomic status categories and maternal age
Outcome
GDM (ICD-10 codes O24.4 and O24.9)
Methodological detailspopulation-based, multivariable models, interaction on multiplicative and additive scales
  • Population-based
  • Multivariable models
  • Interaction on multiplicative and additive scales

Main finding

As reported in the abstract

GDM by socioeconomic status

Socioeconomic differences in gestational diabetes mellitus (GDM) attributed to BMI

Up to 64.0%

Socioeconomic differences in GDM attributed to smoking

5.5%

Observational data: associations, not effects.

Further findings

OutcomeaOR (95% CI)
GDM in women ≥35 years vs upper level women aged <19 yearsUpper level, ≥35 yearsvs Upper level, <19 years3.28 (2.08–5.18)
GDM in women ≥35 years vs upper level women aged <19 yearsLong-term unemployed, ≥35 yearsvs Upper level, <19 years5.29 (3.35–8.35)

GDM incidence by period

GDM incidence 2008-2011
8.7%
GDM incidence 2012-2015
12.5%

Original publication

Socioeconomic status, maternal risk factors, and gestational diabetes mellitus across reproductive years: a Finnish register-based study. BMJ Open Diabetes Res Care. Published 16 August 2023. doi:10.1136/bmjdrc-2022-003278

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