TableĀ 4

Characteristics of people misdiagnosed and miscoded

T2DMs patients misclassified as T1DM tend to be older than the true T1DM patients but this was not statistically significantT2DM misclassified as T1DM mean age 46.4 vs true T1DM 44.4 (independent t test p=0.56)
T2DMs misclassified as T1DM have lower HbA1c than true T1DM, but this was not statistically significantT2DM misclassified as T1DM 8.4% vs true T1DM 9.2% (independent t test p=0.11)
True T2DM people tend to have significant decreases in HbA1C levelsMean earliest recorded HbA1c of 8.7% vs mean current recorded HbA1c of 8.1% (paired t test p=0.032)
True T2DM people tend to have significant increases in body mass indexFrom 28.5 (SEM=0.63) to 29.3 (SEM=0.67) (paired t test p=0.02)
People miscoded and so not on disease registers have higher HbA1cs than those without errors and on disease registers, but this was not statistically significantHbA1C 8.5% (SEM 0.26) vs HbA1C 8.2% (SEM 0.22) (p=0.372)
People with correct codes and diagnosis on disease registers have significant improvements in their HbA1c reductionsMean earliest recorded HbA1c of 8.7% (SEM 0.22) decreasing to a current mean recorded HbA1c of 8.1% (SEM 0.21) (paired t test p=0.032)
  • HbA1C, glycated haemoglobin; T1DM, type 1 diabetes mellitus; T2DM, type 2 diabetes mellitus.