TAKing Steps for Incentives (TAKSI)

TAKing Steps for Incentives (TAKSI) - A Randomized Controlled Trial to Motivate and Sustain Physical Activity Using Financial Incentives

The purpose of this study is to test the overall effects of incentives on physical activity among older taxi drivers, and whether mental accounting exists in this context.

Study Overview

• Status: Completed
• Conditions: Physical Activity; Incentives
• Intervention / Treatment: Behavioral: Incentive-based physical activity program; Behavioral: 3-month follow up

Detailed Description

As part of the 4-month Randomized Controlled Trial, participating taxi drivers will be assigned to 1 of 2 groups where they will receive either cash or taxi rental credits for meeting specified monthly step goals measured via a step counter. Subsequently, for an additional 3 months, drivers will be incentivized to wear step counters to test if effects of the rewards are sustained once the reward is no longer in place. Effects will be quantified in terms of step activity; and in terms of changes in Body Mass Index (BMI), Resting Heart Rate (HR), Blood Pressure (BP), self-reported General Health, Health-Related Quality of Life (HR-QOL) and work productivity.

• Study Type: Interventional
• Enrollment (Actual): 314
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Singapore
  • Singapore, Singapore, 169857
    • Duke-NUS Graduate Medical School

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 50 years to 75 years (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Must be a taxi driver who is a hirer, and who drives for at least 8 hours daily over 5 days
• Aged between 50 to 75
• English/Mandarin-speaking

Exclusion Criteria:

• Report difficulty doing 10 minutes of aerobic activities without stopping, walking up 10 stairs without stopping or performing basic activities of daily living
• Have any medical conditions that limit their ability to walk as a means of physical activity

Study Plan

How is the study designed?

Design Details

• Primary Purpose: PREVENTION
• Allocation: RANDOMIZED
• Interventional Model: PARALLEL
• Masking: SINGLE

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Cash Only (CO); As part of the Incentive-based physical activity program, drivers assigned to the Cash Only (CO) arm will earn incentives in the form of cash for meeting specified monthly step goals from Months 1 to 4.	Behavioral: Incentive-based physical activity program; Drivers will be offered rewards valued at a day's rental for meeting daily step targets over the specified number of days each month from Months 1 to 4, where steps will be tracked by a step counter. They will also be offered incentives for meeting the following criteria: Accurately predicting step target attainment the following months (SGD10); Wearing and providing step data over the month (SGD10 and a chance to win 1 of 3 cash prizes valued at SGD500); Behavioral: 3-month follow up; After the 4-month RCT, drivers will be incentivized to wear the step counter for another 3 months (i.e. Months 5 to 7) to test if effects of the rewards are sustained once the reward is no longer in place. For wearing their step counter and providing their step data, drivers will receive a modest cash incentive (amounting to SGD10) each month as well as the chance to win 1 of 3 cash prizes valued at SGD500.
Experimental: Mental-Accounting (MA) based; As part of the Incentive-based physical activity program, drivers assigned to the Mental-Accounting (MA) based arm will receive incentives in the form of taxi rental credits for meeting specified monthly step goals from Months 1 to 4.	Behavioral: Incentive-based physical activity program; Drivers will be offered rewards valued at a day's rental for meeting daily step targets over the specified number of days each month from Months 1 to 4, where steps will be tracked by a step counter. They will also be offered incentives for meeting the following criteria: Accurately predicting step target attainment the following months (SGD10); Wearing and providing step data over the month (SGD10 and a chance to win 1 of 3 cash prizes valued at SGD500); Behavioral: 3-month follow up; After the 4-month RCT, drivers will be incentivized to wear the step counter for another 3 months (i.e. Months 5 to 7) to test if effects of the rewards are sustained once the reward is no longer in place. For wearing their step counter and providing their step data, drivers will receive a modest cash incentive (amounting to SGD10) each month as well as the chance to win 1 of 3 cash prizes valued at SGD500.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Steps taken	Steps will be assessed using Fitbit, which has an in-built 3-axis accelerometer that measures motion patterns. This will be evaluated monthly, from pre-Baseline through Month 7.	7 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Body Mass Index (BMI)	BMI will be evaluated using measured height and weight, and will be assessed at Months 0 (Baseline), 4 and 7.	7 months
Resting Heart Rate	Resting Heart Rate will be evaluated using a clinically validated machine (Welch Allyn SPOT Vital Signs Monitor), and will be assessed at Months 0 (Baseline), 4 and 7.	7 months
Blood Pressure	Blood pressure will be evaluated using a clinically validated machine (Welch Allyn SPOT Vital Signs Monitor), and will be assessed at Months 0 (Baseline), 4 and 7.	7 months
Self-reported General Health	Self-reported General Health will be evaluated using a validated survey instrument (SF12), and will be assessed at Months 0 (Baseline), 4 and 7.	7 months
Health-Related Quality of Life (HR-QOL)	Health-Related Quality of Life will be evaluated using a validated instrument (EQ-5D), and will be assessed at Months 0 (Baseline), 4 and 7.	7 months
Work Productivity	Work Productivity will be evaluated using a validated instrument (Work Productivity Activity Impairment Questionnaire) and other work-related data, and will be assessed throughout Months 0 (Baseline), 4 and 7.	7 months

Collaborators and Investigators

• Sponsor: Duke-NUS Graduate Medical School
• Investigators: Principal Investigator: Eric A Finkelstein, Ph.D, M.H.A., Duke-NUS Graduate Medical School

Study record dates

Study Major Dates

• Study Start: November 1, 2013
• Primary Completion (Actual): December 1, 2015
• Study Completion (Actual): December 1, 2015

Study Registration Dates

• First Submitted: July 1, 2013
• First Submitted That Met QC Criteria: July 1, 2013
• First Posted (Estimate): July 4, 2013

Study Record Updates

• Last Update Posted (Estimate): January 5, 2016
• Last Update Submitted That Met QC Criteria: January 3, 2016
• Last Verified: January 1, 2016

More Information

Terms related to this study

• Keywords: Physical Activity; Older adults; Incentives; Mental Accounting
• Other Study ID Numbers: DPRT/AGE/2010/20