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

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):

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

Download this project

Published Versions

V1 [2017-05-22]

Export

Dublin Core

DDI 2.5

DDI 3.1

Report a Problem

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

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

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.