Table 1 Sample characteristics of the combined 1H-MRS and cognition cohort.

From: Impaired verbal memory function is related to anterior cingulate glutamate levels in schizophrenia: findings from the STRATA study

 

n = 85

Sex male/female

71/14

Age (years)

29.47 ± 8.29

Age of onset (years)

24.44 ± 6.47

Duration of illness (years)

4.83 ± 6.30

Diagnosis psychosis unspecified/schizophrenia/delusional disorder

21/63/1

Ethnicity White/Black/Mixed White Black/Asian/Other

44/22/5/7/7

Benzodiazepine yes/no

Aug-77

Antidepressant yes/no

13/72

Current smoking no/less than daily/daily

35/5/45

Current cannabis yes/no

Oct-75

CPZE dose (mg/day)

456.54 ± 298.39

Current antipsychotic

 Amisulpride

6

 Aripiprazole

18

 Clopixol

3

 Paliperidol

4

 Haloperidol

1

 Flupenthixol

2

 Olanzapine

20

 Quetiapine

11

 Risperidone

13

 Combination

7

Symptom severity

 PANSS total

68.92 ± 18.6

 PANSS positive

16.88 ± 6.16

 PANSS negative

17.24 ± 5.61

 PANSS general

34.80 ± 9.15

Cognition

 Verbal memory

39.41 ± 11.10

 Verbal fluency

31.53 ± 9.10

 Working memory

18.31 ± 4.33

 Attention & information processing speed

47.25 ± 11.17

 Motor speed*

67.82 ± 14.67

 Executive function

16.42 ± 4.07

 BACS-t*

31.41 ± 13.04

 BACS-z*

−1.84 ± 1.32

Glutamate neurometabolites

 ACC Glucorr (total, n = 85)

−0.01 ± 0.97

 CU (n = 8)

13.07 ± 1.97

 UoE (n = 12)

14.17 ± 3.37

 UoM (n = 31)

15.22 ± 4.14

 KCL (n = 34)

17.52 ± 3.85

 CRLB

5.82 (0.88)

 ACC Glxcorr (total, n = 85)

−0.01 ± 0.98

 CU (n = 8)

17.44 ± 3.21

 UoE (n = 12)

20.76 ± 4.61

 UoM (n = 31)

21.70 ± 5.87)

 KCL (n = 34)

23.12 ± 4.46)

 CRLB

6.18 (1.36)

  1. Age age at study enrolment, CPZE chlorpromazine equivalent dose, ACC anterior cingulate cortex, CU Cardiff University, UoE Edinburgh University, UoM University of Manchester, KCL King’s College London, CRLB Cramér–Rao lower bounds.
  2. Data are expressed as mean ± unless otherwise stated. Site-specific glutamatergic metabolite concentrations are expressed as absolute values corrected for voxel tissue content. Total glutamatergic metabolite concentrations are corrected for voxel tissue content and expressed as z-scores.
  3. *n = 84 because one participant did not complete the Token Motor Task and therefore also had no composite (t or z) scores.