New insights into discrepancies between self-reported and accelerometer-measured moderate to vigorous physical activity among women – the mPED trial

Table 3 Classification of subjects into four groups based on accelerometer and the 7 Day-Physical Activity Recall (7D-PAR) (N= 215)

		Accelerometer measured physical activity
		≥150 min of activity per week^a	<150 min of activity per week^a	Predictive value
7D-PAR	≥150 min of activity per week	Both 7D-PAR and accelerometer group 8.4 % (n = 18)	7D-PAR only group 46.0 % (n = 99)	Positive predictive value 18/117 = 15.4 %
7D-PAR	<150 min of activity per week	Accelerometer only group 0 % (n = 0)	Neither group 45.6 % (n = 98)	Negative predictive value 98/98 = 100 %

^a Accumulation of at least 10 min duration (allowing for 1 to 2 min interruption) of moderate to vigorous physical activity (MVPA)