Table 2 Performance on neuropsychological battery

  REY I immediate recall

19,576

5.91

2.35

29,073

5.85

1.91

  REY II delayed recall

19,462

4.36

2.59

29,041

4.04

2.17

  Animal Fluency

20,432

20.97

6.52

29,365

21.41

6.47

  MAT

18,823

25.98

9.60

28,606

26.54

8.75

  Stroop Interference

-

-

-

29,675

2.159

0.731

  FAS total

-

-

-

28,994

39.21

12.79

Cognitive impairment on individual tests

Available N

# Imp

%^a

Available N

# Imp

%^a

 Based on REY I immediate recall

19,488

1176

5.5

29,024

1671

5.8

 Based on REY II delayed recall

19,374

1026

5.3

28,715

1560

5.4

 Based on Animal Fluency

19,472

1100

5.6

28,804

1521

5.3

 Based on MAT score

18,246

1654

7.8

28,014

2122

7.6

 Based on Stroop Interference

-

-

-

29,626

1602

5.4

 Based on FAS total

-

-

-

27,724

1512

5.5

Cognitive impairment on overall 4-test battery ^b

 Cognitively Impaired

16,371

664

3.1

27,203

983

3.6

 Not impaired

15,707

95.9

26,220

96.4

 Unclassified due to missing data — out of total N

(4870)

(22.9)

(2894)

(9.6)

Cognitive impairment on overall 6-test battery ^c

 Cognitively impaired

-

-

-

25,168

1528

6.1

 Not impaired

23,640

93.9

  (Unclassified due to missing data — out of total N)

(4929)

(16.4)