I only found one decent study looking at age and length of diabetes in people with frozen shoulder. It claimed the risk did not go up for type 1 diabetics until they had been diagnosed 20 years.
None of the studies I found on type 1 or type 2 diabetes on frozen shoulder showed a strong statistical link of gHbA1c and frozen shoulder; some found a weak link.
When comparing the risk to nondiabetics, the studies I found had a range of risk of 33% increase compared to nondiabetics (a large large Chinese one year study where a large group of shoulder complaints was lumped together), up to 860% (a small Scottish study that looked specifically at confirmed frozen shoulder).
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