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Table 3 Spearman correlation coefficients for the relationship among physical activity variables

From: Intensity and timing of physical activity in relation to postmenopausal breast cancer risk: the prospective NIH-AARP Diet and Health Study

Physical activity, by intensity and period of life Physical activity, by intensity and period of life
  Light physical activity Moderate-to-vigorous physical activity
Light physical activity 15-18 years 19-29 years 35-39 years 15-18 years 19-29 years 35-39 years Past 10 years
   15-18 years - 0.65 0.52 0.53 0.41 0.30 0.12
   19-29 years 0.65 - 0.79 0.38 0.50 0.42 0.21
   35-39 years 0.52 0.79 - 0.31 0.44 0.49 0.29
   Past 10 years 0.35 0.53 0.66 0.21 0.32 0.39 0.49
  Moderate-to-vigorous physical activity     
Moderate-to-vigorous physical activity 15-18 years 19-29 years 35-39 years     
   15-18 years - 0.69 0.53     
   19-29 years 0.69 - 0.79     
   35-39 years 0.53 0.79 -     
   Past 10 years 0.28 0.45 0.61