thanks for query
all landmark trial have shown significant reduction in microvascular complication of diabetes
after good control of diabetes which is actually defined as HbA1c
less than 6.5%(without hypoglycemia
).it is HbA1c not blood glucose
which is true reflection of good control.
second important point is early part of diabetes(at onset) should be agreesively treated because it is early metabolic memory which determines microvascular complication.
i hope i have answered your query and waiting for your followup queries