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Feasibility and validity of a wearable GPS device for measuring outings after stroke. Dr Annie McCluskey, Faculty of Health Sciences

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Feasibility and validity of a wearable GPS device for measuring outings after stroke. Dr Annie McCluskey, Faculty of Health Sciences

  1. 1. Feasibility and validity of a wearable GPS device for measuring outings after stroke Dr Annie McCluskey with A/Prof Louise Ada, A/Prof Cath Dean, Janine Vargas Faculty of Health Sciences Contact: annie.mccluskey@sydney.edu.au
  2. 2. The Problem Self-Report Methods:  Diary/calendar - Burdensome; time consuming Potential to over/under report outings Objective Methods  Pedometers, accelerometers etc - May miss valuable data (vehicle journeys)  Global positioning system (GPS): - Less costly than observation Used to measure mobility and wandering - people with dementia Accuracy and feasibility unknown in stroke population 2
  3. 3. The Approach  Prospective cohort design  Stroke sample (n=20):    Mean 43 mths post stroke (SD 20) 70% male Walking performance (6MWT):     Mean distance: 288m (SD 96), range 106m-494m Mean age: 67 yrs (SD 12) Drivers: 5% (n=1) Public transport: 55% (n=11) 3
  4. 4. EZ-23 Personal Tracker (www.ezy2c.com) On/Off button Main screen
  5. 5. GPS signal obtained ~ every 2 mins = 1 outing
  6. 6. Data Collection  GPS device = 7 days  Diary = 7 days  Observation = Half-day 6
  7. 7. Results 1: Equipment Failure Problem Faulty GPS device = 3/5 60% Faulty battery chargers = 8/15 50% 7
  8. 8. Results 2: Human Error Problem Thought device was on (it wasn’t) = 11/20 55% Forgot to switch device on/ recharge = 4/20 20% 8
  9. 9. Results 3: Data Loss 215 of 1680 hours over 7 days = 13% data loss (= 87% GPS data recovery) 9
  10. 10. Results 4: Number of outings (beyond front gate, n=20 people) Observation Diary GPS Total (7 days) N/A 159 133 Mean (7 days) N/A 8.0 6.7 Mean (Half-day) 0.7 0.7 0.6 10
  11. 11. Results 5: Comparison with Observation Level of Agreement † Method Diary % Exact 94% 89% % Close * † GPS 100% 100% Over a half-day compared to observation * Within 1 outing 11
  12. 12. Conclusions  Good agreement/accuracy  Feasible for people with stroke to use  Real-time monitoring required: Google maps  Clinical implications:  Diary is a valid self-report measure of daily outings  Measure of change in community rehabilitation  GPS now being used in the ‘Out-and-About’ Trial

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