In females, vitamin D (5th), C-reactive protein (6th), glycated haemoglobin, (HbA1c), a marker of elevated blood sugar in the last 3 months, (13th) and forced vital capacity (18th) were protective, whilst chest pain or discomfort (7th), self-reported nervous feelings (8th) and bilirubin (12th) were associated with increased PD risk. The gene discussed is CRP; the disease is Parkinson disease.