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SOF vs NSRR visit number for sleep study

I'm trying to figure out when sleep was measured in the SOF dataset; was it visit 8 or visit 9? On https://sleepdata.org/datasets/sof/pages, it states that “Sleep studies were completed on 461 SOF participants at Visit 8.” The SOF description, however, indicates it was Visit 9, as can be seen on http://sof.ucsf.edu/interface/DataNews.asp, “Visit 9 (Year 20) questionnaire and exam data for entire cohort (additional sleep measures in subset).”

This is important because the SOF online variables are coded by visit number.

Matt,

I am 95% certain the PSG measurements (i.e. EDF/XML and dataset we have on NSRR) correspond with Visit 8.

I took a glance at 'v8sleep.zip' and 'v9sleep.zip' from here: http://sof.ucsf.edu/interface/DataDoc.asp. The "additional sleep measures" in V9 are derived from a night of Masimo Oximeter data, which were also read and scored in our Reading Center. The variables in the V8 sleep dataset align with the variables we generate for our full PSG datasets.

Thanks for the clarification.

Let's bump up your 95% to 100%. I found the visit descriptions here: http://sof.ucsf.edu/Docs/Complete_description_of_each_visit.pdf.

Visit 8 was the PSG: Sleep Wrist Actigraphy

• Average 4 nights/5 days actigraphy data Ambulatory Monitoring Inc. Sleep-Watch® O Polysomnography (in-home, subset of 500) Siesta® by Compumedics

Plus standard questionnaires:

Sleep patterns Pittsburgh Sleep Quality Index, Epworth Sleepiness Scale, Functional Outcomes of Sleep Questionnaire, minutes until asleep, time wake up/fall asleep, hours per night, problems associated with, frequency

Visit 9 included the standard questionnaires for everyone, and some specific followups for the sleep subset.

Sleep patterns: Pittsburgh Sleep Quality Index, Epworth Sleepiness Scale, minutes until asleep, time wake up/fall asleep, hours per night, problems associated with, frequency

ADDITIONAL MEASURES FOR SLEEP/COGNITION VISIT SOF Details of Measurements (updated June 2013) p 26 of 29

Wrist Actigraphy Average 4 nights/5 days actigraphy data Octagonal Motionlogger SleepWatch (catalog no. 26.100)

Oximetry Masimo Rad8 Signal Extraction Pulse Oximeter Sleep Patterns Functional Outcomes of Sleep Questionnaire Restless Legs Syndrome Questionnaire Visual Acuity Bailey-Lovie Exam

Nice find -- thanks!