TABLE 4–1 Longitudinal Studies

Researcher

Age Group

Ratio

Group size

Duration

Abecedarian Project (Campbell and Ramey, 1994)

Infants,

1:3

14

5 years

preschool

1:6

12

 

Brookline Early Education Project (Hauser-Cram et al., 1991)

Infants,

1:1

 

5 years

preschool

1:6

18

 

Early Childhood Education Project (Sigel et al., 1973; Cataldo, 1978)

2–3 years

1:7

22

3 years

Early Training Project (Gray et al., 1982)

Preschool

1:5

20

2 or 3 years

Family Development Research Program (Honig and Lally, 1982)

Infants, preschool

1:4

8

5 years

Harlem Training Project (Palmer, 1983)

Preschool

1:1

NA

1–2 years

Infant Health and Development Program (Ramey et al., 1992; Infant Health and Development Program Consortium, 1990)

1–2 years

1:3

6

3 years

2–3 years

1:4

8

 

Milwaukee Project (Garber, 1988)

2 years

1:2

?

6 years

3 years

1:3

 

 

preschool

1:7

 

 

Perry Preschool Project (Schweinhart and Weikart, 1993)

Preschool

1:5

20–25

2 years

Project CARE (Wasik et al., 1990)

Infants,

1:3

14

5 years

preschool

1:6

12

 

 

SOURCES: Data from Frede (1998) and Lazar et al. (1977).



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