Laboratory investigations of the studied groups regarding cognitive impairment

VariablePD with cognitive impairment (n = 33)PD without cognitive impairment (n = 47)p value
Hb (g/dL)11.8 ± 1.1111.7 ± 0.90.614
Platelets (× 109/L)242.4 ± 28.18247.9 ± 28.650.4
WBCs (× 109/L)7.2 ± 1.087.7 ± 1.130.075
FBS (mg/dL)121.2 ± 49.0395.02 ± 33.230.006*
HbA1C (%)5.6 ± 1.015.4 ± 0.740.199
Serum creatinine (mg/dL)0.6 ± 0.190.6 ± 0.170.822
Urea (mg/dL)42.5 ± 13.6241.6 ± 11.820.729
ALT (U/L)45.3 ± 12.7647.9 ± 11.660.359
AST (U/L)35.4 ± 11.3136.1 ± 12.450.806
TSH (mIU/L)3.1 ± 0.493.3 ± 0.490.041*
Free T4 (ng/dL)1.6 ± 0.091.5 ± 0.090.464
Free T3 (ng/dL)4.04 ± 0.224.03 ± 0.210.892

* Data is significant; p value < 0.05. PD: Parkinson’s disease; Hb: hemoglobin; WBCs: white blood cells; FBS: fasting blood glucose; HbA1C: hemoglobin A1c; ALT: alanine aminotransferase; AST: aspartate aminotransferase; TSH: thyroid-stimulating hormone