Title: 
Sleep Timing, Chronotype, and PTSD: An Individual Participant Data Meta-Analysis [Data Files]
	
Description:
An individual participant data meta-analysis was conducted to examine 1) the degree to which bedtime, wake time, and chronotype correlate with posttraumatic stress disorder (PTSD) severity among individuals diagnosed with PTSD, 2) the standardized mean difference in bedtime, wake time, and chronotype for those with and without a PTSD diagnosis, and 3) moderators of these relationships. This deposit includes the full dataset used for data analyses. 
Methodology:
A comprehensive search was run in Ovid MEDLINE, PsycInfo (EBSCOHost), Embase (Embase.com via Elsevier), Scopus (Scopus.com via Elsevier), PTSDpubs (ProQuest), Dissertations & Theses (ProQuest), and the Cochrane Library. In addition to database searching, we followed several supplementary search procedures, including reviewing the reference lists of relevant review articles and studies included in this analysis, and asking contacted authors for further study suggestions. We reached out to the corresponding authors of studies that met our inclusion criteria to request their data for our statistical analysis. 
Creators:
	Alyson K Zalta
	Kathryn Vanderboll
	Amy L. Dent
	Isaias M. Contreras
	Nadia Malek
	Xrystyan N. Lascano
	Kelly L. Zellner
	Jyotsna Grandhi
	Precious J. Araujo
	Kelci Straka
	Cathy Z. Liang
	Jordyn E. Czarny
	Jazmin Martinez
	Helen J. Burgess

Depositor: 
	Kathryn Vanderboll, kvanderb@umich.edu 

Project Lead Contact Information: 
Alyson K. Zalta, azalta@uci.edu

DOI of Published Study:
	https://doi.org/10.1016/j.psychres.2023.115061

To Cite the Published Study:
Zalta, A. K., Vanderboll, K., Dent, A. L., Contreras, I. M., Malek, N., Lascano, X. N., Zellner, K. L., Grandhi, J., Araujo, P. J., Straka, K., Liang, C. Z., Czarny, J. E., Martinez, J., & Burgess, H. J. (2023). Sleep timing, chronotype, and posttraumatic stress disorder: An individual participant data meta-analysis. Psychiatry research, 321, 115061. Advance online publication. https://doi.org/10.1016/j.psychres.2023.115061

To Cite this Data Set:
Zalta, A. K., Vanderboll, K., Dent, A. L., Contreras, I. M., Malek, N., Lascano, X. N., Zellner, K. L., Grandhi, J., Araujo, P. J., Straka, K., Liang, C. Z., Czarny, J. E., Martinez, J., Burgess, H. J. Sleep Timing, Chronotype, and PTSD: An Individual Participant Data Meta-Analysis [Data Files] [Data set], University of Michigan - Deep Blue Data. https://doi.org/10.7302/k1tp-dv03
Discipline: 
	Health Sciences
Psychology

Keywords:
	Posttraumatic Stress Disorder
	Sleep Timing
	Chronotype
	Meta-Analysis
License: 
	Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Technology Requirements:
No proprietary software is required to open any of these files. 
File Descriptions:
01 _ReadMe.rtf: Contains descriptions of the rest of the contents of this data deposit. This is the file you are currently reading.
02_PTSD_and_Sleep_Meta_Data.csv: Provides the dataset used for data analyses. Blank cells in the spreadsheet represent either non-applicable or missing data.  
03_StudyID_to_Citation_Key.csv: Provides a key linking the study identification number in the dataset (file 2) to the citation that the data was retrieved from.
04_Variable_Definitions.csv: Provides a definition for each variable in the dataset (file 2).