OBJECTIVE To examine rates of severe hypoglycemia (SH) in a large population-based cohort of children with type 1 diabetes and relationships to HbA1c.
RESEARCH DESIGN AND METHODS Data from 1,683 children (mean [SD] age at diagnosis 10.5 ± 4.2; range 1–18 years) from 2000 to 2009 were analyzed from the Western Australian Childhood Diabetes Database. Rates of SH were related to HbA1c using negative binomial regression.
RESULTS A total of 7,378 patient-years of data and 780 SH events were recorded. The rate of SH per 100 patient-years peaked at 17.3 in 2001 and then declined from 2004 to a nadir of 5.8 in 2006. HbA1c <7% was not associated with higher risk of SH (incidence rate ratio 1.2 [95% CI 0.9–1.6], P = 0.29) compared with HbA1c of 8–9%.
CONCLUSIONS In a sample of youth with type 1 diabetes, there has been a decrease in rates of SH and a weaker relationship with glycemic control than previously observed.
- Received April 19, 2011.
- Accepted August 17, 2011.
- © 2011 by the American Diabetes Association.
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