Table 1.

Selected participant characteristics at baseline according to physical activity levels

Characteristics at baselineEpisodes of sweat-inducing activities/wk (%)*
City blocks walked/d (%)*
Flights of stairs climbed/d (%)*
None (n = 3,215)1 or more (n = 1,614)None (n = 2,204)1 or more (n = 2,610)0-2 (n = 2,187)3 or more (n = 2,639)
Age, y
    43-49162016181222
    50-59263025292430
    60-69273028282828
    70-79231722202716
    80-869395104
Sex
    Male434537493947
    Female575563516153
Smoking status
    Never454547434644
    Former324133383635
    Current231421191821
Body mass index tertile (kg/m2)
    1 (<26.2)323632343135
    2 (26.2-30.3)333631363235
    3 (>30.3)352936303630
Alcohol drinks/wk
    None534556465646
    <5202820252124
    ≥5262724292329
Education, y
    <12341933253623
    12444344434245
    >12223823322232
Mean (SD) heart rate38.6 (5.9)37.5 (5.8)38.5 (6.0)38.0 (5.8)38.5 (6.0)38.0 (5.8)
Mean (SD) WBC count (×103/μL)7.5 (2.2)7.1 (1.9)7.5 (2.2)7.3 (2.1)7.6 (2.3)7.2 (2.0)
Mean (SD) albumin (g/dL)4.6 (0.4)4.7 (0.3)4.6 (0.4)4.7 (0.4)4.6 (0.4)4.7 (0.4)
  • * Information regarding episodes of activity was missing for 2 participants, blocks walked was missing for 17 participants, and stairs climbed was missing for 5 participants.

  • Thirty-second heart rate.