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Table 1 Schedule of the study visits and planned assessments in OFFER trial

From: Omega-3 fatty acids in first-episode schizophrenia - a randomized controlled study of efficacy and relapse prevention (OFFER): rationale, design, and methods

ID

Variable

Study visits

V1

V2

V3

V4

V5

V6

V7

V8

V9

  

Week

0

1

2

4

6

8

16

26

52

1

Clinical measures

PANSS

X

X

X

X

X

X

X

X

X

CGI-S

X

X

X

X

X

X

X

X

X

CGI-I

X

X

X

X

X

X

X

X

X

CDSS

X

X

X

X

X

X

X

X

X

GAF

X

X

X

X

X

X

X

X

X

2

Insight questionnaire

“My thoughts and feelings”

X

    

X

 

X

X

3

Prostaglandin synthesis (PGD2, PGE2)

Niacin flush skin test

X

    

X

 

X

 

4

Cognitive function tests: Working memory and Executive functions

TMT Part A and B, and their alternate forms, i.e. Part C, D and Digit Span Forward and Backward

X

    

X

 

X

 

Verbal memory

CVLT

X

X

X

Visual memory

BVRT

X

X

X

Abstract thinking

Halstead Category Test

X

X

X

Verbal fluency

Semantic and Phonological

X

X

X

5

Magnetic Resonance Imaging

Grey matter thickness - VBM

X

      

X

 

Fractional anisotropy – DTI

X

X

6

Oxidative stress

Isoprostane 8-epi-PGF2alpha (plasma)

X

    

X

 

X

 

Antioxidative defense

Total plasma antioxidative capacity

X

X

X

7

Neuronal plasticity

Plasma BDNF concentration

X

    

X

 

X

 

8

Dietary questionnaire

Diet history questionnaire

X

        

9

Metabolic syndrome traits

Plasma lipid profile

X

    

X

 

X

X

(biochemical assessments)

Fasting Blood Glucose level

X

X

X

X

10

Metabolic syndrome traits

Body weight

X

X

X

X

X

X

X

X

X

Waist circumference

X

X

X

X

X

X

X

X

X

(clinical measures)

Blood pressure

X

X

X

X

X

X

X

X

X

  1. Abbreviations: PANSS – Positive and Negative Syndrome Scale, CGI-S - Clinical Global Impressions - Severity, CGI-I - Clinical Global Impressions - Improvement, CDSS - Calgary Depression Scale for Schizophrenia, GAF – Global Assessment of Functioning, PGD2 – Prostaglandin D2, PGE2 - Prostaglandin E2, TMT – Trail Making Test Part, CVLT – California Verbal Learning Test, BVRT - Benton Visual Retention Test , VBM – Voxel Based Morphometry, DTI –Diffusion tensor Imaging, 8epiPGF2alpha – plasma concentration of prostaglandin 8-epi-F-2alpha, BDNF – plasma concentration of brain derived neurotrophic factor.