Table 2—

Simple correlations between HbA1c and plasma glucose levels at different times of the day in patients with non–insulin-treated type 2 diabetes

Outpatients
Inpatients
ClinicHome
n37130455
HbA1c vs. prebreakfast PG0.483*0.580*0.646*
HbA1c vs. postbreakfast PG0.445*0.568ND
HbA1c vs. prelunch PG0.496*0.673*0.630*
HbA1c vs. postlunch PG0.477*0.580*0.550*
HbA1c vs. predinner PG0.491*0.674*0.620*
HbA1c vs. postdinnerND0.4950.528*
HbA1c vs. mean daily PG0.574*0.685*0.694*
HbA1c vs. Δ PG prepost breakfast0.1800.225ND
HbA1c vs. Δ PG prepost lunch0.0550.0420.003
HbA1c vs. Δ PG prepost dinnerND−0.0400.090
  • *

    * P < 0.001;

  • P < 0.01;

  • P < 0.05. PG, plasma glucose.