Blog 4 - What Verisense metrics should I use for analysis?

Our fourth blog post further explores the activity and sleep metrics the Verisense platform outputs, which can be used for analysis.

There are a large number of metrics available in the Verisense outputs. This blog will provide a brief summary of the different types of metrics available and then suggest metrics to use for initial analysis if you aren’t sure where to start.

Verisense provides activity and sleep metrics on a nightly / daily basis as well as an averaged basis for each patient. The sleep and activity information can be found in the .csv files that Verisense Outputs. Sample .csv files can be downloaded here.

Part2 metrics provide analysis on the raw acceleration signals without respect to sleep times. Part4 metrics provide information on sleeping quantity and quality. Part5 metrics provide information on activity levels and sedentary periods during waking periods. The files that contain ‘nightsummary’ or ‘daysummary’ in the title provide information for each night or day of recording, while the files that contain ‘summary’ in the title provide averaged information for each day or night in the trial. A more in-depth description of results can be found here.

If you are not familiar with this type of data the following metrics are recommended to start with, in order to develop an understanding of the full range of available metrics.

Variable	Daily	Average over all days*
Inactivity	✔	✔
Inactivity > 30min	✔	✔
Moderate-to-Vigorous PA	✔	✔
Non-wear time	✔	✔
Sleep onset time	✔	✔
Wake time	✔	✔
Sleep period window	✔	✔
Sleep efficiency	✔	✔

*Averaged values are provided for all days, for week days, for week-end days as well as a weighted average.

The following tables provide information on what metric in what .csv file provides the relevant information on a daily / nightly basis as well as on an averaged basis.

Daily Activity and Sleep Metrics

Variable	Unit	Description	Variable  Name	File  Location
Date	date		calendar_date	part5_daysummary_  MM_L30M100V400_T5A5.csv
Week day		Day of the week	weekday	part5_daysummary_  MM_L30M100V400_T5A5.csv
Inactivity   time	min	Sum on inactivity time on each day	dur_day_total_IN_min	part5_daysummary_  MM_L30M100V400_T5A5.csv
MVPA   Bouts	min	Sum of all MVPA in bouts of over 10 minutes	dur_day_MVPA_bts  _10_min	part5_daysummary_  MM_L30M100V400_T5A5.csv
Inactivity   bouts     >   30min	min	Sum of inactivity bouts over 30 min	dur_day_IN_bts_30_min	part5_daysummary_  MM_L30M100V400_T5A5.csv
Sleep   efficiency	%	Percentage of sleep versus neurological   wakefulness during the sleep period time window	sleep_efficiency	part5_daysummary_  WW_L30M100V400_T5A5.csv
Non wear   time	%	Percentage of non- wear time on each   day	nonwear_perc_day_spt	part5_daysummary_  MM_L30M100V400_T5A5.csv
Sleep date	date	Calendar date for sleep onset time and wake   time	calendar_date	Part4_nightsummary_sleep  _cleaned.csv
Sleep   week day		Day of the week for sleep onset time and wake   time	weekday	Part4_nightsummary_sleep  _cleaned.csv
Sleep   onset time	time   of   day	Time of sleeponset each night	sleeponset_ts	Part4_nightsummary_sleep  _cleaned.csv
Wake time	time   of   day	Time of waking up each morning	wakeup_ts	Part4_nightsummary_sleep  _cleaned.csv
Sleep   period   window	hr	Time from sleeponset to wake	SptDuration	Part4_nightsummary_sleep  _cleaned.csv

Averaged Activity and Sleep Metrics

Variable	Unit	Description	Variable Name	File Location
Number of days		Number of valid days	Nvaliddays	Part5_personsummary_ WW_L30M100V400_T5A5.csv
Number of week days		Number of valid week days	Nvaliddays_WE	Part5_personsummary_ WW_L30M100V400_T5A5.csv
Number of weekend days		Number of weekend days	Nvaliddays_WD	Part5_personsummary_ WW_L30M100V400_T5A5.csv
Avg inactivity	min	Average inactivity over all days	dur_day_total_IN_min_pla	Part5_personsummary_ WW_L30M100V400_T5A5.csv
Avg bouted Inactivity	min	Average inactivity in 30min periods	dur_day_IN_bts_30_min_pla	Part5_personsummary_ WW_L30M100V400_T5A5.csv
Avg MVPA time	min	Average MVPA time in bouts of over 10 min	dur_day_MVPA_bts_10_min_pla	Part5_personsummary_ WW_L30M100V400_T5A5.csv
Avg sleep efficiency	%	Average sleep efficiency	sleep_efficiency_pla	Part5_personsummary_ WW_L30M100V400_T5A5.csv
Avg sleep period time	hr	Average sleep period time	sptDuration_AD_mn	part4_summary_sleep_cleaned.csv
Avg sleep efficiency	%	Average sleep efficiency	sleep_efficiency_AD_mn	Part4_summary_sleep_cleaned.csv
Avg sleep onset time	hr	Average sleep onset time	sleeponset_AD_mn	part4_summary_sleep_cleaned.csv
Avg wake time	hr	Average wake time	wakeup_AD_mn	part4_summary_sleep_cleaned.csv