Table 4.

Results of the author’s analysis or reanalyzed (Wyatt, 1991, 1995a) contemporaneous control group studies examining the effects of early intervention on the long-term outcome of schizophrenia

Study	Improved outcome between early and normal intervention with antipsychotic medication
Wirt & Simon (1959)	p<0.01
Pritchard (1967a, b)	p=0.1
Schooler et al. (1967)	Inconclusive
May et al. (1976a, b)	p<0.05
Wyatt et al. (1997)	(p<0.01)
Carpenter et al. (1977)	Inconclusive
Rappaport et al. (1978)	Inconclusive
Matthews et al. (1979)	Inconclusive
Karon & Vandenbos (1981)	Inconclusive