Source Paper
Dopaminergic foundations of schizotypy as measured by the German version of the Oxford-Liverpool Inventory of Feelings and Experiences (O-LIFE)—a suitable endophenotype of schizophrenia
Phillip Grant, Yvonne Kuepper, Eva A. Mueller, Catrin Wielpuetz, Oliver Mason et al.
Frontiers in Human Neuroscience • 2013
O-LIFE Test-Retest Reliability
Objective: Evaluate test-retest reliability of the German version of the O-LIFE questionnaire through re-administration 3 months after initial assessment
Gather these items before starting the experiment. Check off items as you prepare.
Materials1
Software1
soscisurvey.de platform
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Protocol Steps
Initial Assessment (Baseline)
Participants from Justus-Liebig-University, Technische Hochschule Mittelhessen, and Erftgymnasium Bergheim received email or personal invitations containing a link to the online O-LIFE questionnaire
Note: Initial sample consisted of 1228 participants (341 male, 887 female) aged 17-75 years (M = 27.1, SD = 9.47, MD = 24)
View evidence from paper
“The email/personal invitations contained a link to an online-version of the inventory programmed by the authors using the platform soscisurvey.de”
Three-Month Interval
Wait 3 months after initial assessment before re-test administration
Note: This interval allows evaluation of test-retest reliability
View evidence from paper
“The sample for the re-test of the O-LIFE was acquired 3 months later in the same fashion as the main sample”
Re-test Administration
Participants receive a second online administration of the O-LIFE questionnaire via the same soscisurvey.de platform. Only the O-LIFE is administered without additional questionnaires to reduce completion time and increase compliance
Note: Re-test sample contained 245 participants (45 male, 200 female) aged 17-58 years (M = 25.83, SD = 8.6, MD = 23)
View evidence from paper
“in this case all other questionnaires and items except the O-LIFE were omitted in order to reduce the time necessary for participants to answer the items and thereby increase compliance”