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Table 5 Repeatability of the EPIC physical activity questionnaire over 10 months

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

EPIC questionnaire measure Mean (SD) differencea Correlation (ρ) 95% CI
Continuous measure (MET hours/week)    
Total non-occupational activity -0.6 (59.0) 0.65 0.55, 0.72
Recreational activity 0.7 (47.7) 0.58 0.48, 0.67
Household activity -1.3 (33.5) 0.73 0.66, 0.79
Vigorous activity, self-ratedb 3.3 (34.7) 0.63 0.54, 0.72
Vigorous activity, MET-assignedb 1.5 (32.4) 0.71 0.63, 0.78
Light-moderate activityc -2.15 (51.0) 0.67 0.58, 0.74
Categorical measure   K w  
Total physical activity index   0.62 0.53, 0.71
Cambridge physical activity index   0.66 0.58, 0.74
  1. P < 0.0001 for all measures.
  2. EPIC, European Prospective Investigation into Cancer and Nutrition; ρ, Spearman rank correlation coefficient; CI, confidence interval; Kw weighted kappa
  3. a Mean (SD) difference in MET-hours/week: EPIC 10-month minus baseline questionnaire.
  4. b Vigorous activity was estimated (1) in a separate question about time in activities causing sweating or faster heartbeat, (2) using the sum of time spent in activities with MET values ≥ 6
  5. c Light-moderate activity was estimated using the sum of time spent in activities with MET values < 6