Evidence Intelligence™
- EvidenceScore™
- 86
- Strong
- ImpactScore™
- 60
- Slightly Positive
- ConsistencyScore™
- 89
- consistent
Supporting studies: Based on 10 studies
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Analyzed using Evidence Intelligence™
Cognitive Behavioral Therapy Enhances Sleep and Lowers Blood Sugar in Diabetes
Last updated August 16, 2026
Key finding
The CBT group had 0.64 lower PSQI scores than the control group at 2 mo.
Cognitive behavioral therapy (CBT) improved sleep quality and reduced glycemic levels in patients with type 2 diabetes compared to usual care.
Quick read
Study at a glance
The essential study design details in one scan.
EvidenceScore™
Moderate
Study type
RCTs
Follow-up
Short-Term (≤3 mo)
Risk of bias
Some Concerns
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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
Cognitive behavioral therapy (CBT) improved sleep quality and reduced glycemic levels in patients with type 2 diabetes compared to usual care.
Clinical relevance
Improving sleep quality and glycemic control is crucial for managing type 2 diabetes. This study suggests that integrating cognitive behavioral therapy into standard care could lead to better health outcomes for patients, potentially reducing the risk of diabetes-related complications.
Keep in mind
Unclear effectiveness for some outcomes. Limited generalizability due to specific population characteristics. Potential confounding factors not accounted for.
Published in
Journal Reference
Publication details and source links for this paper.
Huai-Zhong Z, Pan Z, Gui-Qiu C, et al. Cognitive behavioral therapy improves sleep quality and reduces glycemic levels in patients with type 2 diabetes mellitus. World Journal of Diabetes. 2021;12(3):292-305. doi:10.4239/wjd.v12.i3.292
Main Effects
CBT group had a 0.64 lower PSQI score at 2 months compared to usual care (p=0.01).
CBT group showed a 0.17% lower HbA1c value at 6 months compared to usual care (p=0.02).
CBT group maintained lower PSQI scores at 6 and 12 months compared to the control group.
Control group had higher HbA1c values compared to the CBT group at both 6 and 12 months.
Evidence network
How this study fits
Understand where this research contributes within the broader evidence network.
Evidence Context
This study contributes evidence to Usual care and HbA1c, Sleep quality.
This study contributes evidence to
Primary intervention
Usual care
Primary outcomes
- HbA1c
- Sleep quality
Evidence relationships
Intervention and outcome relationships this study adds to the evidence network.
2
Evidence pairs
2
Relationships
1
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: 51
1
Related topics
2
Evidence pairs
348
Related studies
High relevance in at least one topic
Why it is useful
- Contributes to 2 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 topic
HbA1c Reduction
matched_outcome
Core evidence
Study findings
The primary outcomes reported in this study.
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 100
- Very Positive
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerEvidence Library
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Evidence Suggest
- CBT reduced PSQI scores by 0.64 at 2 months, indicating improved sleep quality.
- CBT lowered HbA1c levels by 0.17% at 6 months, suggesting better glycemic control.
- Control group consistently had higher PSQI and HbA1c values than CBT group.
Who this applies to
- Adults diagnosed with type 2 diabetes mellitus.
- Patients experiencing sleep disturbances related to diabetes.
Keep in Mind
- Results may not apply to all demographics or diabetes types.
- Further research needed to confirm long-term benefits of CBT.
- Study design limitations may affect the interpretation of results.
Between the Lines
- Unclear effectiveness for some outcomes.
- Limited generalizability due to specific population characteristics.
- Potential confounding factors not accounted for.
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 Usual care and HbA1c, Usual care and Quality of Life Outcomes.
Related evidence relationships
Explore in Evidence ExplorerThis study contributes to the evidence on the following intervention-outcome relationships.
Behavioral & Lifestyle
Usual care → HbA1c
Behavioral & Lifestyle
Evidence Intelligence™
- EvidenceScore™
- 86
- Strong
- ImpactScore™
- 60
- Slightly Positive
- ConsistencyScore™
- 89
- consistent
Supporting studies: Based on 10 studies
View evidenceBehavioral & Lifestyle
Usual care → Quality of Life Outcomes
Behavioral & Lifestyle
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 100
- Very Positive
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
View evidenceIncluded in these evidence collections
Curated evidence collections and hubs this study is part of.
HbA1c Evidence Hub
All studies measuring HbA1c
10 studies
outcome_hubMeasures HbA1c as a key outcome.
Usual care Evidence Hub
All studies on Usual care
10 studies
intervention_hubContributes to Usual care evidence base.
Quality of Life Outcomes Evidence Hub
All studies measuring Quality of Life Outcomes
1 studies
outcome_hubMeasures Quality of Life Outcomes as a key outcome.
Explore more in Evidence Explorer
Jump to pre-filtered views in Evidence Explorer.
All studies on Usual care and HbA1c
Intervention: Usual careOutcome: HbA1c
10 results
All studies on Usual care and Sleep quality
Intervention: Usual careOutcome: Sleep quality
1 results
All studies on Usual care
Intervention: Usual care
10 results
All studies measuring HbA1c
Outcome: HbA1c
10 results
All studies measuring Sleep quality
Outcome: Sleep quality
1 results
Questions answered by this study
Generated from the study's connected evidence using Evidence Intelligence™.
Does Usual care improve HbA1c?
Strong Evidence
Usual care may improve HbA1c.
ConsistencyScore™: Results are consistent across studies.
Ranked evidence signals
- 1
HbA1c
EvidenceScore™ Strong | EvidenceScore™ 85.8 | weak positive | ConsistencyScore™ Consistent | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
- Population details are unavailable.
Does Usual care improve sleep quality?
Emerging Evidence
Usual care appears to improve Sleep quality.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Sleep quality
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | 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.
Next steps
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