Correlations between baseline glycated hemoglobin (HbA1c) and delta HbA1c at 6 months in the three groups are shown. The baseline HbA1c and delta HbA1c of 222 patients with type 2 diabetes without adjustments for antidiabetic agents within 6 months of treatment were analyzed using Spearman's rank correlation. The plots and regression line were stratified by three groups. Negative correlations were found in (a) patients who had no medication for dyslipidemia and began pitavastatin treatment (N to P group; ρ = −0.329, P = 0.006) and (b) patients who were switched from atorvastatin to pitavastatin treatment (A to P group; ρ = −0.480, P < 0.001), (c) but not in patients who continued atorvastatin treatment (A to A group; ρ = −0.015, P = 0.895). The correlation remained significant after adjusting for age, body mass index, dose of pitavastatin, estimated glomerular filtration rate and high‐density lipoprotein cholesterol (in the N to P group: ρ = −0.358, P = 0.016; in the A to P group: ρ = −0.478, P = 0.001; in the A to A group: ρ = 0.015, P = 0.933).