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ABCD Youth Fitbit Daily Physical Activity Summaries

7,439 Shared Subjects

This instrument includes daily physical activity (and sedentary behavior) at the minute level based on heart rate and accelerometer data from fitbit.  
Clinical Assessments
Activity
04/08/2020
abcd_fbdpas01
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_startdate Date Recommended First day of (expected) wear of 3 week protocol fitbit_ss_protocol_startdate
fit_ss_protocol_wear Integer Recommended Is this day during the 3 week protocol period? 0;1 0=no; 1=yes fitbit_ss_protocol_wear
fit_ss_wear_date Date Recommended Date of Participant Wear Only days included in the protocol wear period are aggregated into the weekly data fitbit_ss_wear_date
fit_ss_day_total_steps_no_el Integer Recommended Total number of steps observed in all minutes (no exclusions) from midnight (00:00) to 11:59PM (23:59) regardless of sleep categorization Potentially useful to see if there are exclusions that include a large amount of activity (EX: Repeated HR at high levels, indicative of exercise time being excluded. EX 2: Many steps taken during periods being identified as "sleep" by 60 second algorithm) fitbit_ss_day_total_steps_no_exclusions
fit_ss_day_min Integer Recommended Number of minutes with heart rate value from midnight (00:00) to 11:59P (23:59) not identified as sleep (at 60 second "classic" level) or exclusion rules fitbit_ss_day_min
fit_ss_night_min Integer Recommended Number of minutes with Heart Rate Value from midnight (00:00) to 11:59P (23:59) that ARE identified as sleep (at 60 second "classic" level) or exclusion rules fitbit_ss_night_min
fit_ss_sleep_min Integer Recommended Number of minutes with Heart Rate Value from midnight (00:00) to 11:59P (23:59) that ARE identified as sleep (at 60 second "classic" level) or exclusion rules from the first minute of sleep on the day in question to the first minute of awake on the next day (i.e crosses midnight) Not useful for much analysis beyond the number of minutes that participants spent in bed. For more complete data on sleep quantity and quality refer to sleep data at daily and weekly levels. fitbit_ss_sleep_min
fit_ss_30_second_data_existed Integer Recommended Does 30 second sleep data exist for this day 0;1 0=no; 1=yes fitbit_ss_30_second_data_existed
fit_ss_excl_day_min Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) not identified as sleep (at 60 second "classic" level) excluded for any reason fitbit_ss_excl_day_min
fit_ss_excl_day_min_hr50 Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) not identified as sleep (at 60 second "classic" level) excluded because HR was lower than 50 bpm 50 BPM was identified as being the lowest physiologically likely HR threshold fitbit_ss_excl_day_min_hr50
fit_ss_excl_day_min_nohr Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) not identified as sleep (at 60 second "classic" level) excluded because there was no HR value for the given minute Lack of a HR value is strongly indicative on non-wear. fitbit_ss_excl_day_min_nohr
fit_ss_excl_day_min_hr_rept Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) not identified as sleep (at 60 second "classic" level) excluded because there were identical HR values repeated for 10+ instances Repeating HR is indicative of either non-wear or disrupted wear that makes all other gathered variables of interest suspect fitbit_ss_excl_day_min_hr_rept
fit_ss_excl_night_min Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) identified as sleep (at 60 second "classic" level) excluded for any reason fitbit_ss_excl_night_min
fit_ss_excl_night_min_hr50 Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) identified as sleep (at 60 second "classic" level) excluded because HR was lower than 50 bpm 50 BPM was identified as being the lowest physiologically likely HR threshold fitbit_ss_excl_night_min_hr50
fit_ss_excl_night_min_nohr Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) identified as sleep (at 60 second "classic" level) excluded because there was no HR value for the given minute Lack of a HR value is strongly indicative on non-wear. fitbit_ss_excl_night_min_nohr
fit_ss_excl_night_min_hr_rept Integer Recommended Number of minutes from midnight (00:00) to 11:59P (23:59) identified as sleep (at 60 second "classic" level) excluded because there were identical HR values repeated for 10+ instances Repeating HR is indicative of either non-wear or disrupted wear that makes all other gathered variables of interest suspect fitbit_ss_excl_night_min_hr_rept
fit_ss_excl_sleep_min Integer Recommended Number of minutes from the first minute of sleep on the day in question to the first minute of awake on the next day excluded for any reason (these data cross midnight) fitbit_ss_excl_sleep_min
fit_ss_excl_sleep_min_hr50 Integer Recommended Number of minutes from the first minute of sleep on the day in question to the first minute of awake on the next day excluded because HR was lower than 50 bpm (these data cross midnight) 50 BPM was identified as being the lowest physiologically likely HR threshold fitbit_ss_excl_sleep_min_hr50
fit_ss_excl_sleep_min_nohr Integer Recommended Number of minutes from the first minute of sleep on the day in question to the first minute of awake on the next day excluded because there was no HR value for the given minute (these data cross midnight) Lack of a HR value is strongly indicative on non-wear. fitbit_ss_excl_sleep_min_nohr
fit_ss_excl_sleep_min_rept Integer Recommended Number of minutes from the first minute of sleep on the day in question to the first minute of awake on the next day excluded because there were identical HR values repeated for 10+ instances (these data cross midnight) Repeating HR is indicative of either non-wear or disrupted wear that makes all other gathered variables of interest suspect fitbit_ss_excl_sleep_min_rept
fit_ss_day_min_gt_600 Integer Recommended Does this day have >599 minutes of non-sleep wear after all exclusions 0;1 0=no; 1=yes Must be yes to be included in weekly aggregation. fitbit_ss_day_min_gt_600
fit_ss_sleep_min_gt_300 Integer Recommended Does this day have >299 minutes of sleep wear (based on 60 second data from fitabase) after all exclusions 0;1 0=no; 1=yes Based on first minute of sleep on the day in question to the first minute of awake on the next day fitbit_ss_sleep_min_gt_300
fit_ss_first_hr_date Date Recommended First day that HR appears in fitabase record fitbit_ss_first_hr_date
fit_ss_weekday Integer Recommended Day of the week 1::7 1=Sunday, 2=Monday, 3=Tuesday, 4=Wednesday, 5=Thursday, 6=Friday, 7=Saturday fitbit_ss_weekday
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_wkno
fit_ss_weekend_ind Integer Recommended Is this day a weekend (Saturday or Sunday) 0;1 0=no; 1=yes fitbit_ss_weekend_ind
fit_ss_total_min Integer Recommended Total number of valid minutes after all exclusions from midnight (00:00) to 11:59 PM (23:59) regardless of sleep status fitbit_ss_total_min
fit_ss_total_step Integer Recommended Total number of steps observed after all exclusions from midnight (00:00) to 11:59 PM (23:59) regardless of sleep status fitbit_ss_total_step
fit_ss_total_ave_met Float Recommended Average METS/minute of all valid minutes after all exclusions from midnight (00:00) to 11:59 PM (23:59) regardless of sleep status 1 MET=Resting Metabolism of average individual (adult)= 3.5 ml/kg/min of O2 consumption fitbit_ss_total_ave_met
fit_ss_total_sedentary_min Integer Recommended Number of minutes of sedentary (<1.5 METS) time observed in all valid minutes after all exclusions from midnight (00:00) to 11:59 PM (23:59) regardless of sleep status fitbit_ss_total_sedentary_min
fit_ss_total_light_active_min Integer Recommended Number of minutes of lightly active time (1.5-2.9 METS) observed in all valid minutes after all exclusions from midnight (00:00) to 11:59 PM (23:59) regardless of sleep status fitbit_ss_total_light_active_min
fit_ss_total_fairly_active_min Integer Recommended Number of minutes of moderately active (3-5.9 METS) time observed in all valid minutes after all exclusions from midnight (00:00) to 11:59 PM (23:59) regardless of sleep status fitbit_ss_total_fairly_active_min
fit_ss_total_very_active_min Integer Recommended Number of minutes of vigorously active (>6 METS) time observed in all valid minutes after all exclusions from midnight (00:00) to 11:59 PM (23:59) regardless of sleep status fitbit_ss_total_very_active_min
fit_ss_fitbit_totalsteps Integer Recommended Fitbit based number of steps for the day FROM DAILY LEVEL SUMMARY Small differences in this value compared to "total step" variable indicative of HR based exclusions. Very large differences likely indicative of poor data capture at minute level fitbit_ss_fitbit_total_steps, fitbit_ss_fitbitbit_totalsteps
fit_ss_fitbit_sedentarymin Integer Recommended Fitbit based number of minutes spent in sedentary (<1.5 METS) time for the day FROM DAILY LEVEL SUMMARY Small differences in this value compared to "Sedentary min" variable indicative o HR based exclusions. Very large differences likely indicative of poor data capture at minute level fitbit_ss_fitbit_sedentary_min, fitbit_ss_fitbitbit_sedentarymin
fit_ss_fitbit_lightlyactivemin Integer Recommended Fitbit based number of minutes spent in light activity (1.5-2.9 METS) for the day FROM DAILY LEVEL SUMMARY Small differences in this value compared to "light_active_min" variable indicative of HR based exclusions. Very large differences likely indicative of poor data capture at minute level fitbit_ss_fitbit_lightly_active_min, fitbit_ss_fitbitbit_lightlyactivemin
fit_ss_fitbit_fairlyactivemin Integer Recommended Fitbit based number of minutes spent in moderate activity (3-5.9 METS) for the day FROM DAILY LEVEL SUMMARY Small differences in this value compared to "fairly_active_min" variable indicative of HR based exclusions. Very large differences likely indicative of poor data capture at minute level fitbit_ss_fitbit_fairly_active_min, fitbit_ss_fitbitbit_fairlyactivemin
fit_ss_fitbit_veryactivemin Integer Recommended Fitbit based number of minutes spent in vigorous (>6 METS) for the day FROM DAILY LEVEL SUMMARY Small differences in this value compared to "very_active_min" variable indicative of HR based exclusions. Very large differences likely indicative of poor data capture at minute level fitbit_ss_fitbit_very_active_min, fitbit_ss_fitbitbit_veryactivemin
fit_ss_fitbit_restingheartrate Integer Recommended Fitbit based number resting heart rate for the day FROM DAILY LEVEL SUMMARY Low(er) resting heart rate is usually indicative of a) stronger cardiac muscle/better cardiorespiratory fitness and b) improved (para)sympathetic nervous tone fitbit_ss_fitbit_resting_heartrate, fitbit_ss_fitbitbit_restingheartrate
fit_ss_mstep_lt_80_dailystep Integer Recommended Is the QC'd step value after all exclusions 80%+ the value of the daily level as reported by fitbit 0=QC'd value 80%+ of daily reported level. 1=QC'd value <80% of daily reported value. A value of 1 indicates that there is likely data loss at the minute level of steps and active level (and possibly heart rate) fitbit_ss_mstep_lt_80_daily_step, fitbit_ss_mstep_lt_80_dailystep
fit_ss_dayt_total_steps Integer Recommended Total number of steps observed during non-sleep (night) valid minutes
fit_ss_dayt_ave_met_value Float Recommended Average METS/minute during non-sleep (night) valid minutes 1 MET=Resting Metabolism of average individual (adult)= 3.5 ml/kg/min of O2 consumption
fit_ss_dayt_sedentary_min Float Recommended Number of minutes of sedentary (<1.5 METS) time observed during non-sleep (night) valid minutes
fit_ss_dayt_light_active_min Float Recommended Number of minutes of lightly active time (1.5-2.9 METS) observed during non-sleep (night) valid minutes
fit_ss_dayt_farily_active_min Float Recommended Number of minutes of moderately active (3-5.9 METS) time observed during non-sleep (night) valid minutes
fit_ss_dayt_very_active_min Integer Recommended Number of minutes of vigorously active (>6 METS) time observed during non-sleep (night) valid minutes
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