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Table 2 Reliability of self-reported behaviours using baseline and repeat assessment in UK Biobank (n = 18,905)

From: Estimating physical activity from self-reported behaviours in large-scale population studies using network harmonisation: findings from UK Biobank and associations with disease outcomes

 BaselineRepeatLambda/kappa (SE)
Years between baseline and repeat:
 < 3 11% 
 ≥ 3 to < 4 24% 
 ≥ 4 to < 5 43% 
 ≥ 5 to < 6 21% 
 ≥ 6 1% 
Minutes per day of:
 Heavy physical work16 (43)11 (36)Λ = 0.527 (0.005)
 Walking/standing work47 (82)31 (70)Λ = 0.482 (0.005)
 Sedentary work112 (143)76 (128)Λ = 0.609 (0.005)
 MVPA83 (99)81 (94)Λ = 0.479 (0.006)
 Walking for pleasure15 (22)16 (24)Λ = 0.520 (0.007)
 Strenuous sports3 (10)2 (10)Λ = 0.453 (0.006)
 Other exercises10 (18)10 (17)Λ = 0.456 (0.006)
 Light DIY11 (26)10 (23)Λ = 0.256 (0.006)
 Heavy DIY7 (19)6 (17)Λ = 0.273 (0.006)
Hours per day of:
 Television viewing3 (1)3 (2)Λ = 0.821 (0.005)
 Computer use1 (1)1 (1)Λ = 0.547 (0.007)
Getting about method:  Κ = 0.324 (0.006)
 Car or public transportation49%48% 
 Mixed use44%45% 
 Walking or cycling7%7% 
Commuting method:  Κ = 0.487 (0.006)
 Car or public transportation90%93% 
 Mixed use7%5% 
 Walking or cycling3%2% 
Hours per day of sleep:  Κ = 0.500 (0.005)
 ≤ 5.03%4% 
 6.018%17% 
 7.042%40% 
 8.030%31% 
 ≥ 9.07%8% 
PAEESR (kJ/day/kg)46 (4)47 (4)Λ = 0.671 (0.005)
IPAQ scoring (MET-minutes/day)345 (411)342 (395)Λ = 0.489 (0.006)
LTPA+OPA scoring (MET-minutes/day)349 (382)281 (337)Λ = 0.552 (0.005)
  1. DIY do-it-yourself, IPAQ International Physical Activity Questionnaire, LTPA+OPA leisure-time and occupational physical activity, MET metabolic equivalent of task, MVPA moderate-to-vigorous physical activity, PAEESR physical activity energy expenditure predicted from self-report, SE standard error, Λ Lambda coefficient, Κ weighted kappa coefficient
  2. Values are mean (standard deviation) unless otherwise stated