Tracking of total physical activity (PA), moderate to vigorous activity (MVPA), and sedentary behavior was assessed in 42 young children (mean age at baseline 3.8 years) over a 2-year period using the Actigraph accelerometer. Tracking was analyzed using Spearman rank correlations, percentage agreements, and kappa statistics. Spearman rank correlations were r = .35 (p = .002) for total PA, r = .37 (p = .002) for MVPA, and r = .35 (p = .002) for sedentary behavior. Percentage agreements for PA, MVPA, and sedentary behavior were 38, 41, and 26 respectively. Kappa statistics for PA, MVPA, and sedentary behavior ranged from poor to fair. Results suggest low levels of tracking of total physical activity, MVPA, and sedentary behavior in young Scottish children over a 2-year period.
Kelly is with the Dept. of Preventive Medicine, The University of Southern California, Los Angeles, CA 90033. Reilly, Montgomery, and Paton are with the Division of Developmental Medicine, University of Glasgow, Glasgow, G3 8SJ UK. Jackson is with the Rowett Research Institute, Aberdeen, AB21 9SB UK. Grant is with the Faculty of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ UK.