SAGE validation sub-studies
Accelerometry and self-reported physical activity: assessing physical activity in older adults
India: Using the same study respondents from the 2005 SAGE Pilot, this 2010 sub-study on physical activity (measured using accelerometer and self-reported using the GPAQ) was conducted in a sample of 200 men and women between the ages of 49 and 90 years in Jodhpur, Rajasthan, India. Respondents wore ActiGraph (Pensacola, FL) GT3X accelerometers at the hip (~1 cm toward the midline from the iliac crest) for seven consecutive days, with the accelerometer set to record data for all three axes at 60 second epochs. Anthropometric dimensions (weight, height, body mass index [BMI; kg/m2]) were obtained following standard practices. The SAGE-PA sub-study used a short survey questionnaire derived from the larger SAGE survey instrument and covered a range of topics, including economic well-being and work history, health state and functioning, preventive health behaviours, social cohesion, and time-use. The interview process also included a timed 4-meter walk and grip strength.
A follow-up of this sample is anticipated in early 2014.
The relationship between clinical markers of frailty and measured physical activity using accelerometers: Results of a SAGE sub-study among older adults in India.
The same validation sub-study using the standard protocol was completed in Uganda in 2013, in collaboration with the Uganda MRC/UVRI team. Using the SAGE-WOPS HIV sample, n=200 men and women wore an accelerometer on the waist for 1 week, and were interviewed using the same survey instruments used in India. Survey results will be available in the public domain at the end of 2014.