Event Title

Performance of self-reported physical activity instrument in pre-adolescents and adolescents in low-resource community settings of Karachi, Pakistan

Location

Auditorium Pond Side

Start Date

26-2-2014 10:30 AM

Abstract

Introduction/objectives: Physical activity (PA) during childhood and adolescence is critical for healthy growth and development. Accurate measurement of PA in children is critical for assessing frequency, duration and intensity to examine the trends, dose response and effectiveness of interventions to reduce the attributable risk of chronic diseases later in life. Objective: assessment of PA is expensive and laborious, thus estimates mostly rely on subjective instruments. However, these instruments have not been validated in South-Asian children and youth. We aimed to evaluate the validity of Youth Physical Activity Questionnaire (YPAQ) against accelerometer as a gold standard and reliability of YPAQ especially for moderate-to-vigorous physical activity (MVPA) in pre-adolescents and adolescents in low-resource communities of Karachi, Pakistan.

Methods: Physical activity was assessed through Actigraph-GT3X accelerometer, worn for 7 consecutive days and concomitantly on YPAQ. The estimated correlation coefficients were tested on the hypothesized population correlation coefficients (ρ) of 0.5 and 0.7 for criterion and reliability respectively. ROC curves constructed on recommended daily MVPA threshold ranges.

Results: A total 252 school-aged 9-14 years children consented for participation and 234 (93%) provided valid accelerometer data. The criterion coefficient (95% CIs) was fair [0.37 (0.24-0.50)] and test-retest coefficient was moderately-strong [0.62 (0.49-0.74)] for MVPA domain. However, these estimates fell short for overall activities [0.13 (0.00-0.26)] and [0.54 (0.42-0.67)] respectively. Sensitivity and specificity and area under the curves for MVPA fell within reasonable discriminatory power ranges.

Conclusions: The performance of YPAQ was fair to moderately-strong for MVPA intensity and could be used to assess this domain of activity in Pakistani pre-adolescents and adolescents. However, it has limited validity and reliability to assess overall physical activities. Further research is needed to develop better tools for valid and precise estimates of PA in South-Asian children and youth, facing a heavy burden of chronic diseases.

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Feb 26th, 10:30 AM

Performance of self-reported physical activity instrument in pre-adolescents and adolescents in low-resource community settings of Karachi, Pakistan

Auditorium Pond Side

Introduction/objectives: Physical activity (PA) during childhood and adolescence is critical for healthy growth and development. Accurate measurement of PA in children is critical for assessing frequency, duration and intensity to examine the trends, dose response and effectiveness of interventions to reduce the attributable risk of chronic diseases later in life. Objective: assessment of PA is expensive and laborious, thus estimates mostly rely on subjective instruments. However, these instruments have not been validated in South-Asian children and youth. We aimed to evaluate the validity of Youth Physical Activity Questionnaire (YPAQ) against accelerometer as a gold standard and reliability of YPAQ especially for moderate-to-vigorous physical activity (MVPA) in pre-adolescents and adolescents in low-resource communities of Karachi, Pakistan.

Methods: Physical activity was assessed through Actigraph-GT3X accelerometer, worn for 7 consecutive days and concomitantly on YPAQ. The estimated correlation coefficients were tested on the hypothesized population correlation coefficients (ρ) of 0.5 and 0.7 for criterion and reliability respectively. ROC curves constructed on recommended daily MVPA threshold ranges.

Results: A total 252 school-aged 9-14 years children consented for participation and 234 (93%) provided valid accelerometer data. The criterion coefficient (95% CIs) was fair [0.37 (0.24-0.50)] and test-retest coefficient was moderately-strong [0.62 (0.49-0.74)] for MVPA domain. However, these estimates fell short for overall activities [0.13 (0.00-0.26)] and [0.54 (0.42-0.67)] respectively. Sensitivity and specificity and area under the curves for MVPA fell within reasonable discriminatory power ranges.

Conclusions: The performance of YPAQ was fair to moderately-strong for MVPA intensity and could be used to assess this domain of activity in Pakistani pre-adolescents and adolescents. However, it has limited validity and reliability to assess overall physical activities. Further research is needed to develop better tools for valid and precise estimates of PA in South-Asian children and youth, facing a heavy burden of chronic diseases.