Criterion related validity of the short form of the International Physical Activity Questionnaire in adults who are blind

Abstract

This study examined the criterion validity and measurement bias of the IPAQ-S in adults who are blind using accelerometry as an objective measure of physical activity. Sixty-seven adults who were legally blind participated. The agreement between the ActiGraph and IPAQ-S for the time spent in moderate or vigorous physical activity and in sedentary behavior was examined by a Bland–Altman analysis, in which the differences between the ActiGraph and IPAQ-S were plotted against the means of both. We conclude that the IPAQ-S has acceptable criterion validity for use with young and middle-aged adults who are blind. However, there is limited agreement on physical activity and sedentary behavior measured with the accelerometer and IPAQ-S. The specificity of IPAQ-S to classify correctly people who achieved current physical activity guidelines was low, whereas the sensitivity was acceptable.