TABLE IV

Coded Difference Scores of Arithmetical Ability

Age To 35 Age Over 36
Therapy Hours High School College High School College

0

24

23

5

16

18

7

23

11

20

2

15

12

1-15

10

18

16

17

17

16

20

23

14

20

25

4

16 plus

14

2

19

12

15

19

2

25

10

16

21

28


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