Objective To examine the validity of the short, last 7-day, self-administered form of the International Physical Activity Questionnaire (IPAQ).Design All subjects wore an accelerometer for seven consecutive days and completed the IPAQ questionnaire on the eighth day. Criterion validity was assessed by linear regression analysis and by modified Bland-Altman analysis. Specificity and sensitivity were calculated for classifying respondents according to the physical activity guidelines of the American College of Sports Medicine/Centers for Disease Control and Prevention.Setting Workplaces in Uppsala, Sweden.Subjects One hundred and eighty-five (87 males) participants, aged 20 to 69 years.Results Total self-reported physical activity (PA) (MET-min day(-1)) was significantly correlated with average intensity of activity (counts min(-1)) from accelerometry (r=0.34, P