TABLE 1.
Selected participant characteristics at baseline according to physical activity levels.
| Characteristics at baseline | Episodes of sweat-inducing activities per week (%)* | City blocks walked per day (%)* | Flights of stairs climbed per day (%)* | |||
|---|---|---|---|---|---|---|
| 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 | ||||||
| 43–49 | 16% | 20% | 16% | 18% | 12% | 22% |
| 50–59 | 26% | 30% | 25% | 29% | 24% | 30% |
| 60–69 | 27% | 30% | 28% | 28% | 28% | 28% |
| 70–79 | 23% | 17% | 22% | 20% | 27% | 16% |
| 80–86 | 9% | 3% | 9% | 5% | 10% | 4% |
| Sex | ||||||
| Male | 43% | 45% | 37% | 49% | 39% | 47% |
| Female | 57% | 55% | 63% | 51% | 61% | 53% |
| Smoking status | ||||||
| Never | 45% | 45% | 47% | 43% | 46% | 44% |
| Former | 32% | 41% | 33% | 38% | 36% | 35% |
| Current | 23% | 14% | 21% | 19% | 18% | 21% |
| Body mass index tertile (kg/m2) | ||||||
| 1 (<26.2) | 32% | 36% | 32% | 34% | 31% | 35% |
| 2 (26.2–30.3) | 33% | 36% | 31% | 36% | 32% | 35% |
| 3 (>30.3) | 35% | 29% | 36% | 30% | 36% | 30% |
| Alcohol drinks/week | ||||||
| None | 53% | 45% | 56% | 46% | 56% | 46% |
| <5 | 20% | 28% | 20% | 25% | 21% | 24% |
| 5 or more | 26% | 27% | 24% | 29% | 23% | 29% |
| Years of education | ||||||
| <12 | 34% | 19% | 33% | 25% | 36% | 23% |
| 12 | 44% | 43% | 44% | 43% | 42% | 45% |
| >12 | 22% | 38% | 23% | 32% | 22% | 32% |
| Mean (SD) heart rate† | 38.6 (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 (×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) |
WBC = white blood cell count.
*
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.