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: 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: 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: caffeine; randomization method; vigilance; mood; randomized controlled trial; probability; expectations

Geographic Coverage: Alabama

Time Period(s): 6/2/2015 – 10/16/2015

Collection Date(s): 7/16/2015 – 10/16/2015

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): experimental data; other; survey data

Collection Notes: See the Methods section of our publication for complete details on data collection.

Methodology

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: Convenience sampling

Data Source: Individuals

Collection Mode(s): cognitive assessment test; on-site questionnaire; other

Scales: The POMS-2 questionnaire employs a Likert-type scale for response options. See the attached Data Dictionary for the exact response options.

Weights: N/A

Unit(s) of Observation: Individuals

Geographic Unit: N/A

Related Publications

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Published Versions

V1 [2017-05-22]

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Dublin Core

DDI 2.5

DDI 3.1

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