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Bimodality in blood glucose distribution: is it universal?
Teck-Onn Lim1, Rugayah Bakri, Zaki Morad
1Clinical Research Centre, Kuala Lumpur Hospital, Malaysia. limto@crc.gov.my
Diabetes Care
|November 28, 2002
Summary
Blood glucose (BG) distribution is bimodal across diverse ethnic groups, even with low diabetes prevalence. This finding suggests diabetes is a distinct condition, not just a measurement extreme.
Area of Science:
- Endocrinology
- Population Health
- Biostatistics
Background:
- Bimodality in blood glucose (BG) distribution is observed in populations with high diabetes and obesity rates.
- Previous studies yielded conflicting results on the universality of BG bimodality.
- This study investigates BG distribution across four distinct ethnic groups in Malaysia.
Purpose of the Study:
- To determine if blood glucose distribution exhibits bimodality in diverse ethnic populations.
- To assess the universality of BG bimodality beyond high-prevalence diabetes groups.
- To investigate factors contributing to discrepancies in previous BG distribution studies.
Main Methods:
- A national health survey in Malaysia (1996) included 18,397 subjects aged 30+ years.
- Post-challenge blood glucose measurements were analyzed.
- Statistical models (unimodal, skewed, and bimodal) were fitted to log-transformed BG data by age and ethnic groups.
Main Results:
- Age-specific diabetes prevalence ranged from 1.3% to 26.3%.
- The bimodal distribution model provided a significantly better fit for log BG data across all ethnic and age groups (P < 0.001).
Conclusions:
- Blood glucose bimodality is evident even in populations with low diabetes and obesity prevalence.
- Inadequate sample size and biases in prior studies may have obscured BG bimodality.
- The findings support the concept of diabetes as a distinct entity rather than a continuous measurement extreme.