Research Summary

Analyzed using Evidence Intelligence™

Tighter glycaemic targets may reduce serious infant morbidity

Last updated June 15, 2026

Key finding

The composite serious health outcome for the infant was reduced in the tighter group (P = 0.032).

This study evaluated the impact of tighter glycaemic control in women with gestational diabetes. It found a reduction in serious health outcomes for infants but an increase in serious maternal health outcomes.

Quick read

Study at a glance

The essential study design details in one scan.

EvidenceScore™

Moderate

Study type

RCTs

Risk of bias

High Risk

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Plain-language summary

What this paper says

A plain-language read of the study’s main message and where it applies.

Study focus

Clinical relevance

These findings highlight the complex balance between maternal and infant health in managing gestational diabetes. While tighter glycaemic control can lead to better outcomes for infants, it may also pose additional risks to mothers, necessitating careful consideration in clinical practice.

Keep in mind

The study's design may limit generalizability to broader populations. Potential confounding factors were not fully controlled. The sample size may affect the robustness of the findings.

Published in

Journal Reference

Publication details and source links for this paper.

Caroline AC, Deborah S, Ruth H, et al. Tighter Glycaemic Targets in Women with Gestational Diabetes: A Stepped-Wedge Cluster-Randomised Trial. PLOS Medicine. 2022;19(9):e1004087. doi:10.1371/journal.pmed.1004087

View DOI

Main Effects

The rate of large for gestational age was similar between groups (14.7% vs 15.1%; P = 0.839).

The composite serious health outcome for infants was reduced in the tighter group (1.3% vs 2.6%; P = 0.032).

Shorter length of stay in intensive care was observed in the tighter group (P = 0.041).

Serious maternal health outcomes increased in the tighter group (5.9% vs 3.0%; P = 0.020).

Evidence network

How this study fits

Understand where this research contributes within the broader evidence network.

Evidence Context

This study contributes evidence to Less tight glycemic control, Tighter glycemic control and Composite cardiovascular events (CV death, MI, stroke, HF hospitalization), Serious maternal health outcome, Serious perinatal adverse events.

This study contributes evidence to

Intervention

Less tight glycemic control

Outcome

Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

Evidence topic

Cardiovascular Risk

Primary intervention

Less tight glycemic control

Primary outcomes

Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)
Serious maternal health outcome
Serious perinatal adverse events

Evidence topics

Cardiovascular Risk

Primary intervention

Less tight glycemic control

Primary outcomes

Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)Serious maternal health outcome Serious perinatal adverse events

Evidence relationships

Intervention and outcome relationships this study adds to the evidence network.

Evidence pairs

Relationships

Evidence topics

contributes_evidence

Editorial context

Why this study matters

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Evidence network role

This section describes how the study fits into the current evidence network. It does not determine whether an intervention works on its own.

Moderate contributionModerate confidenceNetwork score: 59

Why it is useful

Contributes to 6 evidence relationships
Includes primary outcome data
Linked to 1 direct semantic evidence topic

Topic contributions

Evidence topic

Contributes evidence

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Primary evidence

Evidence relationship

Glycemic Control Treatments and Cardiovascular Outcomes

Related evidence

Evidence topic

Cardiovascular Risk

Save evidence

Intervention

Glycemic Control Treatments

Save evidence

Core evidence

Study findings

The primary outcomes reported in this study.

Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

Less tight glycemic control → Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 100; Very Positive
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

Add to Evidence Tracker

Serious maternal health outcome

Less tight glycemic control → Serious maternal health outcome

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 25; Negative
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

Add to Evidence Tracker

Serious perinatal adverse events

Less tight glycemic control → Serious perinatal adverse events

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 50; Neutral
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

Add to Evidence Tracker

Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

Tighter glycemic control → Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 100; Very Positive
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

Add to Evidence Tracker

Serious maternal health outcome

Tighter glycemic control → Serious maternal health outcome

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 25; Negative
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

Add to Evidence Tracker

Serious perinatal adverse events

Tighter glycemic control → Serious perinatal adverse events

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 50; Neutral
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

Add to Evidence Tracker

Evidence Library

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Evidence Suggest

Tighter glycaemic control reduced serious health outcomes for infants (1.3% vs 2.6%; P = 0.032).
Increased serious maternal health outcomes in the tighter group (5.9% vs 3.0%; P = 0.020).
More women required pharmacological treatment with tighter targets (67.9% vs 58.5%; P = 0.047).

Who this applies to

Women diagnosed with gestational diabetes.
Pregnant women requiring glycaemic management.

Keep in Mind

Results may not apply to all populations with gestational diabetes.
The study did not account for all potential confounding variables.
Further research is needed to explore long-term outcomes for mothers and infants.

Between the Lines

The study's design may limit generalizability to broader populations.
Potential confounding factors were not fully controlled.
The sample size may affect the robustness of the findings.

Evidence Library

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Connected Evidence

Explore related studies, evidence collections, and research questions.

Relationships organized using the Dediabetes Evidence Intelligence™ framework.

This study contributes to evidence on Glycemic Control Treatments and Cardiovascular Outcomes, Glycemic Control Treatments and Serious maternal health outcome.

Related evidence relationships

Explore in Evidence Explorer

This study contributes to the evidence on the following intervention-outcome relationships.

Procedures

Detailed evidence

Glycemic Control Treatments → Cardiovascular Outcomes

Procedures

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 100; Very Positive
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

View evidence

Procedures

Detailed evidence

Glycemic Control Treatments → Serious maternal health outcome

Procedures

Evidence Intelligence™

EvidenceScore™: Emerging; Score 59 · Based on 1 study
ImpactScore™: 25; Negative
ConsistencyScore™: unclear; Not enough independent studies

Based on 1 study

View evidence

Included in these evidence collections

Curated evidence collections and hubs this study is part of.

Cardiovascular Outcomes Evidence Hub

All studies measuring Cardiovascular Outcomes

1 studies

outcome_hub

Measures Cardiovascular Outcomes as a key outcome.

Glycemic Control Treatments Evidence Hub

All studies on Glycemic Control Treatments

1 studies

intervention_hub

Contributes to Glycemic Control Treatments evidence base.

Serious maternal health outcome Evidence Hub

All studies measuring Serious maternal health outcome

1 studies

outcome_hub

Measures Serious maternal health outcome as a key outcome.

Explore more in Evidence Explorer

Jump to pre-filtered views in Evidence Explorer.

All studies on Less tight glycemic control and Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

Intervention: Less tight glycemic controlOutcome: Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

1 results

All studies on Less tight glycemic control and Serious maternal health outcome

Intervention: Less tight glycemic controlOutcome: Serious maternal health outcome

1 results

All studies on Less tight glycemic control

Intervention: Less tight glycemic control

1 results

All studies measuring Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

Outcome: Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)

1 results

All studies measuring Serious maternal health outcome

Outcome: Serious maternal health outcome

1 results

Questions answered by this study

Generated from the study's connected evidence using Evidence Intelligence™.

Does Glycemic Control Treatments improve cardiovascular outcomes?

Strong Evidence

Glycemic Control Treatments may improve Cardiovascular Outcomes.

ConsistencyScore™: Results are mixed and should be interpreted cautiously.

Evidence caveat: The available evidence reports mixed findings.

Ranked evidence signals

1
Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study

Why this answer: This answer is cautious because the available studies report mixed findings.

Limitations

Population details are unavailable.

View Full Evidence

Does Less tight glycemic control affect serious perinatal adverse events?

Emerging Evidence

Current evidence does not show a clear benefit of Less tight glycemic control for Serious perinatal adverse events.

ConsistencyScore™: Consistency cannot yet be determined from the available evidence.

Ranked evidence signals

1
Serious perinatal adverse events
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | neutral | ConsistencyScore™ Unclear | 1 study

Why this answer: This answer is based on a single supporting study.

Limitations

Only one supporting study is available.
Consistency cannot yet be determined.
Population details are unavailable.

View Full Evidence

Does Tighter glycemic control affect serious perinatal adverse events?

Emerging Evidence

Current evidence does not show a clear benefit of Tighter glycemic control for Serious perinatal adverse events.

ConsistencyScore™: Consistency cannot yet be determined from the available evidence.

Ranked evidence signals

1
Serious perinatal adverse events
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | neutral | ConsistencyScore™ Unclear | 1 study

Why this answer: This answer is based on a single supporting study.

Limitations

Only one supporting study is available.
Consistency cannot yet be determined.
Population details are unavailable.

View Full Evidence

Does Less tight glycemic control improve serious maternal health outcome?

Emerging Evidence

Less tight glycemic control may worsen Serious maternal health outcome or be associated with harm.

ConsistencyScore™: Consistency cannot yet be determined from the available evidence.

Ranked evidence signals

1
Serious maternal health outcome
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | moderate negative | ConsistencyScore™ Unclear | 1 study

Why this answer: This answer is based on a single supporting study.

Limitations

Only one supporting study is available.
Consistency cannot yet be determined.
Population details are unavailable.

View Full Evidence

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Next steps

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Evidence topics

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Cardiovascular Risk Evidence Hub

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All studies on Less tight glycemic control and Serious perinatal adverse events All studies on Tighter glycemic control and Serious perinatal adverse events All studies on Less tight glycemic control and Composite cardiovascular events (CV death, MI, stroke, HF hospitalization)All studies on Less tight glycemic control and Serious maternal health outcome

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