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Table 2 Trajectories of physical activity and the effects of time-varying predictors on trajectory shapes, by trajectory group (n = 4952)a

From: Trajectories of self-reported physical activity and predictors during the transition to old age: a 20-year cohort study of British men

  Parameterb Estimate SE p value
Low Decreasing
  Intercept 1.362 0.052 <0.001
  Linear 0.073 0.015 <0.001
  Quadratic −0.006 0.001 <0.001
  Time-varying covariates    
  Not employed −0.306 0.077 <0.001
  N. of CVD diagnoses −0.408 0.050 <0.001
Light Stable
  Intercept 2.212 0.042 <0.001
  Linear −0.011 0.003 <0.001
  Time-varying covariates    
  Not employed 0.324 0.050 <0.001
  N. of CVD diagnoses −0.118 0.042 0.005
Moderate Increasing
  Intercept 3.631 0.050 <0.001
  Linear 0.024 0.004 <0.001
  Time-varying covariates    
  Not employed 0.847 0.065 <0.001
  N. of CVD diagnoses −0.060 0.060 0.313
  1. aEstimates for time-varying covariates represent the shift in physical activity trajectory per unit change in exposure variable
  2. bModels adjusted for employment status and number of CVD diagnoses as time-varying covariates, and occupational class, marital status, number of children, region, BMI, arthritis, bronchitis, blood pressure, breathlessness, chest pain, smoking status, alcohol consumption and breakfast consumption at baseline