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) 6/2/2015 – 10/16/2015
Collection Date(s):  View help for Collection Date(s) 7/16/2015 – 10/16/2015
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

337
Views
1
Downloads
1
Related Publication

See more details

Project Level Views Downloads

Published Versions

V1 [2017-05-22]

Report a Problem

Found a serious problem with the data, such as disclosure risk or copyrighted content? Let us know.

Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 International License.

openICPSR data are distributed exactly as they arrived from the data depositor. ICPSR has not checked or processed this material. Users should consult the investigator(s) if further information is desired.