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ABCD Youth Fitbit Weekly Sleep Summaries

4,709 Shared Subjects

This instrument includes sleep level aggregated to the week level for all valid days (i.e. >180 minutes of sleep time).  Metrics include sum of and average number of instances of, and number of minutes in, each sleep stage.  Average HR within each stage is also included.  Weeks are broken into weekday only, weekend only, and all days of week.
Clinical Assessments
Sleep
04/08/2020
abcd_fbwss01
10/27/2020
View Change History
01
Query Element Name Data Type Size Required Description Value Range Notes Aliases
subjectkey GUID Required The NDAR Global Unique Identifier (GUID) for research subject NDAR*
src_subject_id String 20 Required Subject ID how it's defined in lab/project
interview_date Date Required Date on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYY
interview_age Integer Required Age in months at the time of the interview/test/sampling/imaging. 0 :: 1260 Age is rounded to chronological month. If the research participant is 15-days-old at time of interview, the appropriate value would be 0 months. If the participant is 16-days-old, the value would be 1 month.
sex String 20 Required Sex of subject at birth M;F; O; NR M = Male; F = Female; O=Other; NR = Not reported
eventname String 60 Required The event name for which the data was collected
fit_ss_protocol_date String 30 Recommended First day of (expected) wear by 3 week protocol fitbit_ss_protocol_date
fit_ss_wkno Integer Recommended Week number since start of protocol Only first 3 weeks will be included in weekly aggregation (protocol length of wear) fitbit_ss_day_wkno, fitbit_ss_wkno
fit_ss_datatype Integer Recommended 0=weekdays only, 1=weekend only, 2=weekday and weekend 0::2 fitbit_ss_datatype
fit_ss_day_count Integer Recommended Number of days included for averages Only days that have a 30 second sleep record are included fitbit_ss_day_count
fit_ss_avg_first_inbed_hour String 30 Recommended First Minute that the participant was identified as being in-bed (but not necessarily asleep) All data is offset by 12 hours so that 00:00= noon, 23:59=11:59A fitbit_ss_avg_first_inbed_hour
fit_ss_avg_first_sleep_hour String 30 Recommended First Minute that the participant was identified as being asleep All data is offset by 12 hours so that 00:00= noon, 23:59=11:59A fitbit_ss_avg_first_sleep_hour
fit_ss_avg_outbed_hour String 30 Recommended First Minute that the participant was identified as being out-bed (but may have woken up prior to this) All data is offset by 12 hours so that 00:00= noon, 23:59=11:59A fitbit_ss_avg_outbed_hour
fit_ss_avg_wakeup_hour String 30 Recommended First Minute that the participant was identified as being awake All data is offset by 12 hours so that 00:00= noon, 23:59=11:59A fitbit_ss_avg_wakeup_hour
fit_ss_sleep_period_minutes Integer Recommended Sum of all Minutes classifed as being any kind of sleep (i.e. light+deep+REM) for all included days fitbit_ss_sleep_period_minutes
fit_ss_sleep_sum_wake_minutes Integer Recommended Sum of Minutes classified as being awake through all sleep periods fitbit_ss_sleep_sum_wake_minutes
fit_ss_sleep_sum_light_minutes Integer Recommended Sum of Minutes classified as being light sleep staging through all sleep periods fitbit_ss_sleep_sum_light_minutes
fit_ss_sleep_sum_deep_minutes Integer Recommended Sum of Minutes classified as being deep sleep staging through all sleep periods fitbit_ss_sleep_sum_deep_minutes
fit_ss_sleep_sum_rem_minutes Integer Recommended Sum of Minutes classified as being REM sleep staging through all sleep periods fitbit_ss_sleep_sum_rem_minutes
fit_ss_sleep_sum_wake_count Integer Recommended Total number of unique awakenings during the sleep period fitbit_ss_sleep_sum_wake_count
fit_ss_avg_sleep_period_min Integer Recommended Average of all Minutes classifed as being any kind of sleep (i.e. light+deep+REM) for all included days fitbit_ss_avg_sleep_period_minutes
fit_ss_sleep_avg_wake_minutes Integer Recommended Average per day of Minutes classified as being awake through all sleep periods fitbit_ss_sleep_avg_wake_minutes
fit_ss_sleep_avg_light_minutes Integer Recommended Average per day of Minutes classified as being awake through all sleep periods fitbit_ss_sleep_avg_light_minutes
fit_ss_sleep_avg_deep_minutes Integer Recommended Average per day of Minutes classified as being awake through all sleep periods fitbit_ss_sleep_avg_deep_minutes
fit_ss_sleep_avg_rem_minutes Integer Recommended Average per day of Minutes classified as being awake through all sleep periods fitbit_ss_sleep_avg_rem_minutes
fit_ss_sleep_avg_wake_count Integer Recommended Total number of unique awakenings during the sleep period Does not include any Minutes anotated as awake prior to the first Minute of sleep (i.e. does not count latency) fitbit_ss_sleep_avg_wake_count
fit_ss_sleep_avg_hr_wake Integer Recommended Average heart rate during Minutes that were classified as awake In the event that the two (2) 30-second epochs within the Minute under review did not agree regarding sleep stage the HR for that Minute was not included. fitbit_ss_sleep_avg_hr_wake
fit_ss_sleep_avg_hr_light Integer Recommended Average heart rate during Minutes that were classified as light sleep stage In the event that the two (2) 30-second epochs within the Minute under review did not agree regarding sleep stage the HR for that Minute was not included. fitbit_ss_sleep_avg_hr_light
fit_ss_sleep_avg_hr_deep Integer Recommended Average heart rate during Minutes that were classified as deep sleep stage In the event that the two (2) 30-second epochs within the Minute under review did not agree regarding sleep stage the HR for that Minute was not included. fitbit_ss_sleep_avg_hr_deep
fit_ss_sleep_avg_hr_rem Integer Recommended Average heart rate during Minutes that were classified as REM sleep stage In the event that the two (2) 30-second epochs within the Minute under review did not agree regarding sleep stage the HR for that Minute was not included. fitbit_ss_sleep_avg_hr_rem
Data Structure

This page displays the data structure defined for the measure identified in the title and structure short name. The table below displays a list of data elements in this structure (also called variables) and the following information:

  • Element Name: This is the standard element name
  • Data Type: Which type of data this element is, e.g. String, Float, File location.
  • Size: If applicable, the character limit of this element
  • Required: This column displays whether the element is Required for valid submissions, Recommended for valid submissions, Conditional on other elements, or Optional
  • Description: A basic description
  • Value Range: Which values can appear validly in this element (case sensitive for strings)
  • Notes: Expanded description or notes on coding of values
  • Aliases: A list of currently supported Aliases (alternate element names)
  • For valid elements with shared data, on the far left is a Filter button you can use to view a summary of shared data for that element and apply a query filter to your Cart based on selected value ranges

At the top of this page you can also:

  • Use the search bar to filter the elements displayed. This will not filter on the Size of Required columns
  • Download a copy of this definition in CSV format
  • Download a blank CSV submission template prepopulated with the correct structure header rows ready to fill with subject records and upload

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