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

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

   Accelerometer measured physical activity  
   ≥150 min of activity per weeka <150 min of activity per weeka 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 %
<150 min of activity per week Accelerometer only group 0 % (n = 0) Neither group 45.6 % (n = 98) Negative predictive value 98/98 = 100 %
  1. a Accumulation of at least 10 min duration (allowing for 1 to 2 min interruption) of moderate to vigorous physical activity (MVPA)