Randomization to Randomization Probability: Estimating Treatment Effects Under Actual Conditions of Use

Principal Investigator(s):  View help for Principal Investigator(s) David B. Allison, University of Alabama at Birmingham

Version:  View help for Version V1

Version Title:  View help for Version Title Initial upload on 5/22/2017

Name File Type Size Last Modified
Data-Dictionary-for-ICPSR.docx application/vnd.openxmlformats-officedocument.wordprocessingml.document 18 KB 05/17/2017 07:26:AM
R2R-pilot-data-for-ICPSR.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet 100 KB 05/17/2017 07:28:AM
r2rpilot_analysis_rc2.sas application/x-sas 40.7 KB 05/17/2017 07:26:AM

Project Citation: 

Allison, David B. Randomization to Randomization Probability: Estimating Treatment Effects Under Actual Conditions of Use. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2017-05-22. https://doi.org/10.3886/E100640V1

Persistent URL:  http://doi.org/10.3886/E100640V1

Project Description

Summary:  View help for Summary This folder contains the data, code, and data dictionary required to reproduce the caffeine pilot study results published in our Psychological Methods manuscript: Randomization to Randomization Probability: Estimating Treatment Effects Under Actual Conditions of Use. 
Funding Sources:  View help for Funding Sources United States Department of Health and Human Services. National Institutes of Health. National Institute of Diabetes and Digestive and Kidney Diseases (P30DK056336); United States Department of Health and Human Services. National Institutes of Health. National Institute of Diabetes and Digestive and Kidney Diseases (T32DK062710); United States Department of Health and Human Services. National Institutes of Health. National Institute of Diabetes and Digestive and Kidney Diseases (R25DK099080); United States Department of Health and Human Services. National Institutes of Health. National Heart Lung and Blood Institute (R25HL124208)

Scope of Project

Subject Terms:  View help for Subject Terms caffeine; randomization method; vigilance; mood; randomized controlled trial; probability; expectations
Geographic Coverage:  View help for Geographic Coverage Alabama
Time Period(s):  View help for Time Period(s)
Universe:  View help for Universe The inclusion criteria of the study were: age≥18; willingness to take 2 caffeine or placebo pills; willingness to abstain from caffeine for 12 hours prior to study visit (8:30pm-8:30am); UAB employees or students with some college education (including current enrollment). The exclusion criteria were: uncorrected vision problems; nicotine use; use of medications for sleep, anxiety, and/or ADHD; pregnant or trying to get pregnant; lactose intolerance. 
Data Type(s):  View help for Data Type(s) experimental data; other; survey data
Collection Notes:  View help for Collection Notes See the Methods section of our publication for complete details on data collection. 

Methodology

Response Rate:  View help for Response Rate
Three hundred forty-one subjects were screened over the phone for eligibility. Of those, 205 attended the single study visit and completed the study. After participation, 5 subjects were deemed ineligible by study staff and were not included in the outcome analysis. The analytic sample size was 200 subjects. 
Sampling:  View help for Sampling Convenience sampling
Data Source:  View help for Data Source Individuals
Collection Mode(s):  View help for Collection Mode(s) cognitive assessment test; on-site questionnaire; other
Scales:  View help for Scales The POMS-2 questionnaire employs a Likert-type scale for response options. See the attached Data Dictionary for the exact response options. 
Weights:  View help for Weights N/A
Unit(s) of Observation:  View help for Unit(s) of Observation Individuals
Geographic Unit:  View help for Geographic Unit N/A

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Published Versions

V1 [2017-05-22]

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DDI 2.5

DDI 3.1

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