Table 1.

Differences between EOS, LOS and VLOS.^4,20,22,23

Features	EOS	LOS	VLOS
Age of onset	<40 years	40–60 years	>60 years
Female preponderance	No	Yes	Definitely
Negative symptoms	Definitely	May be	Less likely
Learning	Ok	Ok	Impaired
Retention	Ok	Ok	Impaired
Progressive cognitive deterioration	Yes	Yes	Yes (very high)
Brain structural abnormalities	No	No	Yes
Family history	Present	Present	Weak association
Early childhood maladjustments	Present	Present	Absent
Antipsychotic dosing	Higher	Lower	Lower
Risk of Tardive Dyskinesia	Present	Present	Very high

EOS, early onset schizophrenia; LOS, late onset schizophrenia; VLOS, very late onset schizophrenia like psychosis.