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Table 3 Agreement of reported physical activity, by time between completing identical questionnaires

From: Reported frequency of physical activity in a large epidemiological study: relationship to specific activities and repeatability over time

  Number of
women
Agreement Kappa (95% CI) with
quadratic weighting
Time between completing identical questions on
the frequency of strenuous activity
(average time between the two)
   
≤ 6 months (0.3 years) 238 64% 0.71 (0.59 - 0.83)
> 6 months - 1 year (0.9 years) 1,224 59% 0.61 (0.55 - 0.67)
> 1 - 2 years (1.5 years) 7,002 54% 0.55 (0.53 - 0.57)
> 2 years (2.6 years) 9,153 52% 0.51 (0.49 - 0.53)
P for trend    0.03
Time between completing identical questions on
the frequency of any activity
(average time between the two)
   
≤ 6 months (0.2 years) 221 57% 0.67 (0.53 - 0.81)
> 6 months - 1 year (0.9 years) 1,171 53% 0.67 (0.61 - 0.73)
> 1 - 2 years (1.5 years) 6,044 48% 0.60 (0.58 - 0.62)
> 2 years (2.6 years) 5,312 47% 0.58 (0.56 - 0.60)
P for trend    0.05
  1. P-values for trend in kappa were estimated by weighted least squares regression using the inverse of the variances of the kappa coefficients