Cited by 315Diabetes Management and ResearchClinical Laboratory Practices and Quality ControlDiabetes, Cardiovascular Risks, and Lipoproteins

The DOI matches its Crossref record; 20 of the 20 references it cites were found in a registry or an index; 13 of the 17 sources its claims cite were checked for support.

Continuous Glucose Monitoring Profiles in Healthy Nondiabetic Participants: A Multicenter Prospective Study

Open access

Abstract

Context: Use of continuous glucose monitoring (CGM) is increasing for insulin-requiring patients with diabetes. Although data on glycemic profiles of healthy, nondiabetic individuals exist for older sensors, assessment of glycemic metrics with new-generation CGM devices is lacking. Objective: To establish reference sensor glucose ranges in healthy, nondiabetic individuals across different age groups using a current generation CGM sensor. Design: Multicenter, prospective study. Setting: Twelve centers within the T1D Exchange Clinic Network. Patients or Participants: Nonpregnant, healthy, nondiabetic children and adults (age ≥6 years) with nonobese body mass index. Intervention: Each participant wore a blinded Dexcom G6 CGM, with once-daily calibration, for up to 10 days. Main Outcome Measures: CGM metrics of mean glucose, hyperglycemia, hypoglycemia, and glycemic variability. Results: A total of 153 participants (age 7 to 80 years) were included in the analyses. Mean average glucose was 98 to 99 mg/dL (5.4 to 5.5 mmol/L) for all age groups except those over 60 years, in whom mean average glucose was 104 mg/dL (5.8 mmol/L). The median time between 70 to 140 mg/dL (3.9 to 7.8 mmol/L) was 96% (interquartile range, 93 to 98). Mean within-individual coefficient of variation was 17 ± 3%. Median time spent with glucose levels >140 mg/dL was 2.1% (30 min/d), and median time spent with glucose levels <70 mg/dL (3.9 mmol/L) was 1.1% (15 min/d). Conclusion: By assessing across age groups in a healthy, nondiabetic population, normative sensor glucose data have been derived and will be useful as a benchmark for future research studies.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

In 153 healthy nondiabetic children and adults aged 7 to 80 years, blinded Dexcom G6 CGM showed a mean 24-hour glucose of 99 ± 7 mg/dL and median 96% time in 70 to 140 mg/dL. Adults ≥60 years had higher mean glucose and less time in range than younger participants.

Key findings

  • Overall mean 24-hour CGM glucose was 99 ± 7 mg/dL, mean within-individual coefficient of variation was 17 ± 3%, and median time between 70 and 140 mg/dL was 96% (IQR 93–98).
  • Mean average glucose was 98–99 mg/dL for all age groups except those ≥60 years, in whom it was 104 mg/dL (P < 0.001); median time in 70–140 mg/dL was lowest at 93% in adults ≥60 years (P < 0.001).
  • Median time >140 mg/dL was 2.1% (30 min/d) and <70 mg/dL was 1.1% (15 min/d); values >180 mg/dL and <54 mg/dL were uncommon, but 28% of participants had at least one hypoglycemic event overall and 14% had an overnight event.
  • The correlation between mean glucose and HbA1c was weak (r = 0.27; 95% CI, 0.12–0.41).

Methods

  • Multicenter, prospective study at 12 T1D Exchange Clinic Network centers; participants were healthy, nondiabetic, nonpregnant children and adults age ≥6 years with nonobese BMI, HbA1c <5.7%, and no islet autoantibodies. Of 201 screened, 153 were analyzed (age 7–80 years; mean 31 years).
  • Participants wore a blinded Dexcom G6 CGM for up to 10 days with once-daily calibration; ≥72 total hours of CGM data with ≥24 overnight hours were required. Mean CGM use was 192 hours (8 days), and MARD versus blood glucose meter was 6.0% (n = 1555 paired measurements).
  • Glucose outcomes were summarized overall and by age group and by daytime/nighttime; analyses included t tests for ≥60 vs <60 years, Pearson correlation for mean glucose and HbA1c, and sensitivity analyses removing implausible values.

Limitations

  • The paper states that 93% of participants were white, so it could not evaluate whether results were consistent across races; possible sensor pressure during sleep may have caused inaccurate CGM readings, and the study could not determine how many nocturnal hypoglycemic events were due to pressure on the sensor.
  • The paper states that after removing implausible data, mean glucose, time in 70–140 mg/dL, and CV were unchanged, but the percentage of participants with a hypoglycemic event was much lower; results may not be generalizable to capillary or laboratory-measured glucose profiles.
  • The paper notes the weak HbA1c–glucose correlation may relate to HbA1c being obtained before CGM data collection and to having at most 10 days of CGM data. Evident from the text: participants were primarily recruited from family, friends, and neighbors of patients seen in diabetes clinics, which may limit generalizability to the broader nondiabetic population.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1210/jc.2018-02763

Cites

20 of 20 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

13 of 17 cited sources checked · 7 supported · 0 flagged · accuracy not yet measured

Show all 36 claims

  • Probably not a substantial claim. 21
  • It may state two separate claims as one. 16
  • The quote only partly states this claim. 3
32 of 32
  • The paper relies on this without support.

    The 153 participants are representative of healthy nondiabetic individuals across age groups.

    “Participants were healthy, nondiabetic children and adults, primarily recruited from family, friends, and neighbors of patients seen in the diabetes clinics.”
    “Because the majority of our participants were white (93%), we were unable to evaluate whether results were consistent across races.”
  • The paper relies on this without support.

    CGM profiles over up to 10 days reflect usual glucose profiles in healthy nondiabetic individuals.

    “An early-generation Dexcom G6 CGM (Dexcom, Inc., San Diego, CA) in blinded mode (i.e., the participant was unable to see the glucose values) was worn for up to 10 days with one daily calibration using a study-provided blood glucose meter (Contour Next EZ; Ascensia Diabetes Care, Parsippany, NJ).”
    “there are at most 10 days of CGM data (16).”
  • The authors state this as an assumption.

    Low CGM readings <50 mg/dL during sleep are likely due to the participant lying on the CGM sensor.

    “any low CGM readings ,50 mg/dL (2.8 mmol/L) during sleep time as defined by logs (in which case the participant was likely to be lying on the CGM sensor)”
  • The paper relies on this without support.

    Participants' daily logs accurately recorded sleep and wake times.

    “Participants completed a daily log indicating times and intensity of any exercise, start times of meals and snacks, and sleep and wake times.”
4 of 4

Citations

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Metadata

Authors
Shah, V. N., DuBose, S. N., Li, Z., Beck, R. W., Peters, A. L., Weinstock, R. S., Kruger, D., Tansey, M., Sparling, D., Woerner, S., Vendrame, F., Bergenstal, R., Tamborlane, W. V., Watson, S. E., & Sherr, J.
Affiliations
  • Barbara Davis Center for Diabetes, Aurora, Colorado
  • Jaeb Center for Health Research (US)
  • University of Southern California (US)
  • SUNY Upstate Medical University (US)
  • Henry Ford Health (US)
  • University of Iowa (US)
  • University of Oklahoma Health Sciences Center (US)
  • Indiana University School of Medicine
  • University of Miami (US)
  • Park Nicollet Clinic (US)
  • Yale University (US)
  • University of Louisville (US)
Corresponding author
DuBose, Stephanie N
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2019-04-25
Volume
104
Issue
10
Pages
4356-4364
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2941246007
Cited by
315
References
17
Citations by year
2026: 57 · 2025: 71 · 2024: 63 · 2023: 41 · 2022: 38 · 2021: 26 · 2020: 15 · 2019: 4
FWCI
14.29
Type
journal article
Language
en
Open access
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion)
Funders
  • Leona M. and Harry B. Helmsley Charitable Trust
  • National Institutes of Health
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Health Sciences › Health Professions › Medical Laboratory Technology › Clinical Laboratory Practices and Quality Control
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
continuous glucose monitoring, glycemic variability, hypoglycemia, hyperglycemia, Dexcom G6, reference values
MeSH terms
Adolescent, Adult, Age Factors, Aged, Blood Glucose, Child, Circadian Rhythm, Female, Humans, Hyperglycemia, Hypoglycemia, Male, Middle Aged, Monitoring, Physiologic, Prospective Studies, Reference Values, Sex Factors, Blood Glucose Self-Monitoring, Benchmarking, Young Adult, Healthy Volunteers

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