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Table 3 Estimates of validity of non-occupational continuous physical activity measurements derived from the EPIC questionnaire when compared to accelerometer measurements of total physical activity

From: Validity and repeatability of the EPIC physical activity questionnaire: a validation study using accelerometers as an objective measure

Accelerometer versus 10-month EPIC MET-hours/week
  Correlation (ρ) 95% CI  
Total non-occupational activitya    
   Overallb (n = 182) 0.21 0.07, 0.35 **
Gender    
Males (n = 100) 0.24 0.05, 0.42 *
Females (n = 82) 0.16 -0.06, 0.36  
Body mass index    
< 27.2 (n = 89) 0.33 0.14, 0.51 **
≥ 27.2 (n = 92) 0.12 -0.09, 0.32  
Age    
< 58 years (n = 95) 0.25 0.05, 0.43 *
≥ 58 years (n = 87) 0.18 -0.03, 0.37  
Employment status    
Full-time work (n = 113) 0.17 -0.02, 0.34  
Other (n = 68) 0.30 0.07, 0.50 *
Vigorous activity, self-ratedc 0.18 0.04, 0.32 *
Vigorous activity, MET-assignedc 0.23 0.09, 0.37 **
Light-moderate activityd 0.19 0.05, 0.33 **
  1. * P < 0.05; ** P < 0.01; *** P < 0.001
  2. EPIC, European Prospective Investigation into Cancer and Nutrition; ρ, Spearman rank correlation coefficient; CI, confidence interval
  3. a EPIC total non-occupational activity = recreational + household physical activity; compared to total accelerometer activity (sum of light, moderate and vigorous activity)
  4. b There were no statistically significant differences in correlations for non-occupational activity between subgroups (Pdiff >0.10)
  5. c Time spent in vigorous non-occupational activity was measured (1) in a separate question about time in activities causing sweating or faster heartbeat, and (2), using the sum of time spent in activities with MET values ≥ 6 (i.e. cycling, sports and stair climbing); these estimates were compared to vigorous-intensity accelerometer activity.
  6. d Time spent in light-moderate non-occupational activity was estimated using the sum of time spent in activities with MET values < 6 (i.e. housework, walking, gardening, home repair); these estimates were compared to light+moderate-intensity accelerometer activity.