Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2019 Jul 17;42(11):zsz165. doi: 10.1093/sleep/zsz165

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Published by Oxford University Press on behalf of Sleep Research Society (SRS) 2019.

This work is written by (a) US Government employee(s) and is in the public domain in the US.

PMC Copyright notice

Figure 2. — Bidirectional case-crossover design used in this analysis. Each segment with an NSVT event was analyzed for hazard period (30 s preceding the onset of NSVT) and control periods selected from 2.5-min control windows spaced at 5-min intervals from the NSVT event. Three 2.5-min control windows with at least 1 30-s epoch of sleep is selected. If there is more than 1 epoch of sleep within the control window, 1 epoch of sleep is randomly selected to serve as the control period.