Table 2 Mean and dispersion values of cognitive performance.

From: Intra- and inter-individual cognitive variability in schizophrenia and bipolar spectrum disorder: an investigation across multiple cognitive domains

Cognitive measures

SZ/HC-mean

SZ/HC-disp

BD/HC-mean

BD/HC-disp

SZ/BD-mean

SZ/BD-disp

t

log p

t

log p

t

log p

t

log p

t

log p

t

log p

Intellectual functioning

 NART

–10.6

–24.7

4.9

6.0

–3.2

–2.8

2.5

1.9

–5.5

–7.3

1.5

0.8

 Matrix Reasoning

–16.7

–58.9

7.3

12.5

–6.7

–10.5

3.7

3.7

–7.4

–12.7

3.1

2.7

 Vocabulary

–18.2

–68.6

7.8

14.0

–5.3

–7.0

3.1

2.7

–9.7

–20.7

3.2

2.8

Psychomotor processing

 Symbol coding

–29.3

–162.1

3.3

2.9

–13.2

–37.8

2.4

1.8

–10.5

–24.2

0.6

0.2

Mental processing

 Reading

–12.8

–35.7

6.1

8.9

–5.7

–7.9

3.0

2.5

–5.8

–8.0

2.2

1.6

 Color naming

–19.8

–80.5

10.0

22.5

–11.3

–28.0

4.7

5.6

–7.4

–12.7

3.8

3.8

Learning and memory

 Immediate recall

–18.8

–72.9

2.0

1.3

–6.6

–10.2

1.9

1.2

–8.8

–17.2

–0.1

0.0

 Thematic recall

–3.4

–3.2

2.9

2.4

0.1

0.0

1.6

1.0

–2.5

–1.9

1.2

0.6

 List learning

–18.3

–69.4

4.7

5.6

–4.6

–5.4

2.2

1.6

–10.2

–22.7

1.6

0.9

 List memory

–16.4

–56.9

6.0

8.6

–4.5

–5.2

1.5

0.9

–9.8

–21.0

3.7

3.6

 List recognition

–9.1

–18.8

6.5

10.1

–3.6

–3.5

2.4

1.8

–5.0

–6.1

2.7

2.2

Semantic fluency

 Category fluency

–25.9

–130.5

2.4

1.8

–9.8

–21.7

2.9

2.5

–10.6

–24.4

–0.9

–0.4

Inhibitory control

 Inhibition

–18.6

–71.9

10.2

23.3

–10.0

–22.3

6.8

11.0

–6.3

–9.3

2.1

1.5

 Inhibition errors

–6.8

–10.9

5.2

6.7

–2.7

–02.1

1.9

1.2

–3.3

–3.0

2.5

1.9

 Inhibition switching

–15.3

–49.6

7.7

13.8

–7.6

–13.3

4.3

4.7

–6.0

–8.6

2.3

1.6

 Switching errors

–10.8

–25.6

7.8

14.1

–6.2

–9.2

4.2

4.6

–3.7

–3.7

2.9

2.4

Working memory

 Letter Number Sequencing

–18.8

–73.2

0.0

0.0

–10.1

–22.6

–0.3

–0.1

–5.6

–7.5

0.4

0.1

 Digit Span Total

–13.2

–37.5

-0.9

-0.4

–7.8

–14.1

–0.8

–0.4

–4.4

–4.8

–0.3

–0.1

 Digit Span Forward

–6.9

–11.2

2.8

2.2

–6.1

–8.8

–0.2

–0.1

–1.3

–0.7

1.6

1.0

 Digit Span Backward

–11.0

–26.6

-0.2

-0.1

–7.1

–11.7

–0.2

–0.1

–3.1

–2.7

–0.5

–0.2

Fine-motor speed

 Grooved Pegboard NDH

–19.3

–76.7

10.6

24.8

–11.2

–27.8

8.6

16.7

–4.4

–4.9

0.8

0.4

 Grooved Pegboard DH

–19.0

–74.1

10.1

22.8

–10.4

–24.0

5.8

8.2

–7.0

–11.3

3.0

2.5

Cognitive composite

–28.6

–156.2

11.3

28.3

–13.6

–39.8

5.3

6.8

–11.9

–30.3

4.1

4.4

Intra-individual variability

17.3

62.9

12.2

32.4

10.0

22.3

6.5

10.1

5.9

8.3

3.6

3.5

  1. Presented are t values and log p values for mean and dispersion (disp) model, SZ > HC, BD > HC and SZ > BD across all cognitive tests, adjusted for age and sex. Significant effects (corrected for multiple comparisons), (α = 0.005/48 tests ~ log10(p) = 3.98, or p < 0.000104) are presented in bold.
  2. NDH Non-Dominant Hand, DH Dominant Hand, HC healthy controls, SZ Schizophrenia, BD bipolar disorder.