What about statistical confounding?
Greenberg
James A
JA
D000328:Adult; D000367:Age Factors; D000368:Aged; D001794:Blood Pressure / Q000502:physiology*; D002318:Cardiovascular Diseases / Q000209:etiology*; D015986:Confounding Factors, Epidemiologic; D003971:Diastole; D016021:Epidemiologic Studies; D005260:Female; D006801:Humans; D006973:Hypertension / Q000453:epidemiology* / Q000209:etiology; D015994:Incidence; D008297:Male; D008875:Middle Aged; D018570:Risk Assessment