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Table 1 Characteristics of respondents who reported stiff or painful joints 'never' or 'rarely' at Time 1

From: Relationship between physical activity and stiff or painful joints in mid-aged women and older women: a 3-year prospective study

  Mid-age women (n = 5,650) Older women (n = 5,207)
Variable Respondents included (n = 4,780) Respondents excludeda (n = 870) P valueb Respondents included (n = 3,970) Respondents excludeda (n = 1,237) P valueb
Age (years, mean ± standard deviation) 52.53 ± 1.49 52.57 ± 1.52 0.366 75.39 ± 1.51 75.60 ± 1.51 <0.001
Education (%)    <0.001    <0.001
   Less than high school 13.5 18.7   26.8 34.7  
   Some high school 47.8 50.9   52.7 47.7  
   Completed high school 20.5 17.4   11.6 9.2  
   Trade certificate/university degree 17.4 12.0   4.7 2.3  
   Missing 0.9 1.0   4.3 6.1  
Area of residence (%)    <0.001    <0.001
   Urban 38.1 43.3   40.2 39.8  
   Large town 13.5 11.4   11.6 14.1  
   Small town/remote area 47.1 42.4   46.6 42.6  
   Missing 1.3 2.9   1.6 3.6  
Country of birth (%)    0.001    0.003
   Australia 74.6 70.9   74.7 71.9  
   Other English-speaking 14.0 12.9   12.4 11.2  
   Non-English speaking 7.9 12.1   6.8 9.3  
   Missing 3.5 4.1   6.0 7.7  
Depression (%)    0.023    <0.001
   No 91.6 89.2   94.3 87.6  
   Yes 8.4 10.8   3.4 7.6  
Number of chronic diseases (%)    0.037    <0.001
   0 55.8 52.6   32.0 42.5  
   1 31.0 30.5   37.0 20.3  
   2 9.7 11.8   20.0 18.0  
   3 2.7 3.7   7.6 10.5  
   4 or more 0.8 1.4   3.3 8.7  
Smoking status (%)    <0.001    0.006
   Never 55.4 54.8   61.0 58.5  
   Former 32.2 26.1   27.6 26.8  
   Current 12.2 18.3   4.9 7.4  
   Missing 0.2 0.8   6.4 7.4  
Body mass index (%)    <0.001    <0.001
   <20 kg/m2 5.1 5.9   3.4 4.4  
   ≥ 20 and <25 kg/m2 41.9 38.6   48.4 46.1  
   ≥ 25 and <30 kg/m2 28.0 26.3   26.5 23.8  
   ≥ 30 kg/m2 17.4 16.8   9.7 9.1  
   Missing 7.5 12.4   12.0 16.6  
Physical activity (%)    <0.001    <0.001
   None (<40 MET.min/week) 14.9 22.2   24.4 40.1  
   Very low (40 to <300 MET.min/week) 18.4 19.5   14.0 14.2  
   Low (300 to <600 MET.min/week) 18.0 15.6   22.7 14.0  
   Moderate (600 to <1,200 MET.min/week) 22.5 19.6   15.8 12.2  
   High (1,200+ MET.min/week) 26.2 23.1   23.1 19.6  
  1. MET, metabolic equivalent value. aWomen were excluded if they did not provide data on physical activity at Time 1 or did not provide data on symptoms of stiff or painful joint at Time 2. The 243 mid-age women and 987 older women who were missing physical activity data are not included in the percentage of excluded respondents in each physical activity category. bP value is for the difference between women included and those excluded from the analysis.