Trial Outcomes & Findings for The JustWalk JITAI Study: A System Identification Experiment to Understand Just-in-Time States of Physical Activity (NCT NCT05273437)
NCT ID: NCT05273437
Last Updated: 2024-11-19
Results Overview
This will be measured continuously for the duration of the study via a Fitbit Versa, a wrist-worn, consumer-level activity tracker.
Recruitment status
COMPLETED
Study phase
NA
Target enrollment
50 participants
Primary outcome timeframe
Everyday from baseline to the end of study (for 270 days)
Results posted on
2024-11-19
Participant Flow
Participant milestones
| Measure |
System Identification
All participants in the study will go through a system identification experiment everyday for 270 days. System identification experiment for physical activity: The system identification experiment in Just Walk JITAI study has two key components that are the focus of the system identification experiment: walking suggestions and daily step goals. To achieve the desired dynamics on the timescale of interest, we used 2 input signals, one for each of the 2 components. Although our study design enables traditional statistical analyses to examine the impact of intervention components on behavioral outcomes, that is not the primary focus of a system ID experiment. The primary goal of a system ID experiment is to estimate and validate dynamical computational models that are validated based on their ability to predict the future responses of each individual's behavior across time. These aims are achieved by having different intervention components-suggestions to walk in the next 3 hours and adaptive goal setting-delivered at different timescales and orthogonally, that is, statistically independent of each other.
|
|---|---|
|
Overall Study
STARTED
|
50
|
|
Overall Study
COMPLETED
|
48
|
|
Overall Study
NOT COMPLETED
|
2
|
Reasons for withdrawal
Withdrawal data not reported
Baseline Characteristics
There were 3 missing data for this measure.
Baseline characteristics by cohort
| Measure |
System Identification
n=48 Participants
All participants in the study will go through a system identification experiment everyday for 270 days. System identification experiment for physical activity: The system identification experiment in Just Walk JITAI study has two key components that are the focus of the system identification experiment: walking suggestions and daily step goals. To achieve the desired dynamics on the timescale of interest, we used 2 input signals, one for each of the 2 components. Although our study design enables traditional statistical analyses to examine the impact of intervention components on behavioral outcomes, that is not the primary focus of a system ID experiment. The primary goal of a system ID experiment is to estimate and validate dynamical computational models that are validated based on their ability to predict the future responses of each individual's behavior across time. These aims are achieved by having different intervention components-suggestions to walk in the next 3 hours and adaptive goal setting-delivered at different timescales and orthogonally, that is, statistically independent of each other.
|
|---|---|
|
Age, Categorical
<=18 years
|
0 Participants
n=48 Participants
|
|
Age, Categorical
Between 18 and 65 years
|
48 Participants
n=48 Participants
|
|
Age, Categorical
>=65 years
|
0 Participants
n=48 Participants
|
|
Age, Continuous
|
38.4 years
STANDARD_DEVIATION 9.3 • n=48 Participants
|
|
Sex: Female, Male
Female
|
29 Participants
n=45 Participants • There were 3 missing data for this measure.
|
|
Sex: Female, Male
Male
|
16 Participants
n=45 Participants • There were 3 missing data for this measure.
|
|
Ethnicity (NIH/OMB)
Hispanic or Latino
|
8 Participants
n=45 Participants • There were 3 missing data for this measure.
|
|
Ethnicity (NIH/OMB)
Not Hispanic or Latino
|
37 Participants
n=45 Participants • There were 3 missing data for this measure.
|
|
Ethnicity (NIH/OMB)
Unknown or Not Reported
|
0 Participants
n=45 Participants • There were 3 missing data for this measure.
|
|
Race (NIH/OMB)
American Indian or Alaska Native
|
1 Participants
n=44 Participants • There were 4 missing data for this measure.
|
|
Race (NIH/OMB)
Asian
|
14 Participants
n=44 Participants • There were 4 missing data for this measure.
|
|
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
|
3 Participants
n=44 Participants • There were 4 missing data for this measure.
|
|
Race (NIH/OMB)
Black or African American
|
2 Participants
n=44 Participants • There were 4 missing data for this measure.
|
|
Race (NIH/OMB)
White
|
17 Participants
n=44 Participants • There were 4 missing data for this measure.
|
|
Race (NIH/OMB)
More than one race
|
2 Participants
n=44 Participants • There were 4 missing data for this measure.
|
|
Race (NIH/OMB)
Unknown or Not Reported
|
5 Participants
n=44 Participants • There were 4 missing data for this measure.
|
|
Region of Enrollment
United States
|
48 participants
n=48 Participants
|
PRIMARY outcome
Timeframe: Everyday from baseline to the end of study (for 270 days)This will be measured continuously for the duration of the study via a Fitbit Versa, a wrist-worn, consumer-level activity tracker.
Outcome measures
| Measure |
System Identification
n=44 Participants
All participants in the study will go through a system identification experiment everyday for 270 days. System identification experiment for physical activity: The system identification experiment in Just Walk JITAI study has two key components that are the focus of the system identification experiment: walking suggestions and daily step goals. To achieve the desired dynamics on the timescale of interest, we used 2 input signals, one for each of the 2 components. Although our study design enables traditional statistical analyses to examine the impact of intervention components on behavioral outcomes, that is not the primary focus of a system ID experiment. The primary goal of a system ID experiment is to estimate and validate dynamical computational models that are validated based on their ability to predict the future responses of each individual's behavior across time. These aims are achieved by having different intervention components-suggestions to walk in the next 3 hours and adaptive goal setting-delivered at different timescales and orthogonally, that is, statistically independent of each other.
|
|---|---|
|
Steps/Day
Participant 1
|
4048.4 Steps/day
|
|
Steps/Day
Participant 2
|
1074.4 Steps/day
|
|
Steps/Day
Participant 3
|
1645.8 Steps/day
|
|
Steps/Day
Participant 4
|
1749.1 Steps/day
|
|
Steps/Day
Participant 5
|
2991.3 Steps/day
|
|
Steps/Day
Participant 6
|
NA Steps/day
Daily intervention effect on Weekend is not available.
|
|
Steps/Day
Participant 7
|
1254.6 Steps/day
|
|
Steps/Day
Participant 8
|
2168.3 Steps/day
|
|
Steps/Day
Participant 9
|
1471.5 Steps/day
|
|
Steps/Day
Participant 10
|
2003.8 Steps/day
|
|
Steps/Day
Participant 11
|
NA Steps/day
Daily intervention effect on both Weekday and Weekend are not available.
|
|
Steps/Day
Participant 12
|
1333.0 Steps/day
|
|
Steps/Day
Participant 13
|
1168.5 Steps/day
|
|
Steps/Day
Participant 14
|
2577.2 Steps/day
|
|
Steps/Day
Participant 15
|
2703.3 Steps/day
|
|
Steps/Day
Participant 16
|
1819.4 Steps/day
|
|
Steps/Day
Participant 17
|
1930.3 Steps/day
|
|
Steps/Day
Participant 18
|
2229.0 Steps/day
|
|
Steps/Day
Participant 19
|
295.0 Steps/day
|
|
Steps/Day
Participant 20
|
1887.8 Steps/day
|
|
Steps/Day
Participant 21
|
1563.3 Steps/day
|
|
Steps/Day
Participant 22
|
704.9 Steps/day
|
|
Steps/Day
Participant 23
|
1703.3 Steps/day
|
|
Steps/Day
Participant 24
|
156.4 Steps/day
|
|
Steps/Day
Participant 25
|
1187.5 Steps/day
|
|
Steps/Day
Participant 26
|
3697.9 Steps/day
|
|
Steps/Day
Participant 27
|
1138.1 Steps/day
|
|
Steps/Day
Participant 28
|
1470.2 Steps/day
|
|
Steps/Day
Participant 29
|
919.0 Steps/day
|
|
Steps/Day
Participant 30
|
NA Steps/day
Daily intervention effect on both Weekday and Weekend are not available.
|
|
Steps/Day
Participant 31
|
1015.9 Steps/day
|
|
Steps/Day
Participant 32
|
NA Steps/day
Daily intervention effect on both Weekday and Weekend are not available.
|
|
Steps/Day
Participant 33
|
449.8 Steps/day
|
|
Steps/Day
Participant 34
|
1228.2 Steps/day
|
|
Steps/Day
Participant 35
|
1074.1 Steps/day
|
|
Steps/Day
Participant 36
|
967.1 Steps/day
|
|
Steps/Day
Participant 37
|
2928.6 Steps/day
|
|
Steps/Day
Participant 38
|
2608.3 Steps/day
|
|
Steps/Day
Participant 39
|
738.2 Steps/day
|
|
Steps/Day
Participant 40
|
2677.5 Steps/day
|
|
Steps/Day
Participant 41
|
783.5 Steps/day
|
|
Steps/Day
Participant 42
|
1631.8 Steps/day
|
|
Steps/Day
Participant 43
|
1387.4 Steps/day
|
|
Steps/Day
Participant 44
|
1008.3 Steps/day
|
Adverse Events
System Identification
Serious events: 0 serious events
Other events: 0 other events
Deaths: 0 deaths
Serious adverse events
Adverse event data not reported
Other adverse events
Adverse event data not reported
Additional Information
Results disclosure agreements
- Principal investigator is a sponsor employee
- Publication restrictions are in place