Table 1.
Baseline Characteristics According to Total and Vigorous Physical Activity
| Total Physical Activitya | Vigorous Physical Activityb | |||||
|---|---|---|---|---|---|---|
| Q1 | Q3 | Q5 | Q1 | Q3 | Q5 | |
| No. of individuals | 9,157 | 9,370 | 9,431 | 17,172 | 5,625 | 7,162 |
| Age (yr) | 54 | 54 | 53 | 56 | 53 | 50 |
| BMI (kg/m2) | 25.4 | 25.1 | 24.3 | 25.4 | 24.9 | 24.1 |
| MET (h/wk) | 1.1 | 11.9 | 61.5 | 8.5 | 14.9 | 64.3 |
| Current smoking (%) | 15.0 | 9.7 | 6.7 | 14.4 | 8.5 | 4.9 |
| Current NSAIDs (%) | 33 | 33 | 32 | 33 | 35 | 30 |
| Lower endoscopy (%)c | 62 | 68 | 69 | 63 | 69 | 71 |
| Physical exam (%)d | 58 | 63 | 62 | 59 | 64 | 63 |
| Total calories (kcal/day) | 1934 | 1981 | 2050 | 1980 | 1983 | 2017 |
| Alcohol (g/day) | 10.9 | 11.3 | 12.2 | 11.7 | 11.1 | 11.6 |
| Total fat (g/day) | 75 | 72 | 68 | 74 | 71 | 67 |
| Total fiber (g/day) | 19 | 21 | 23 | 20 | 22 | 23 |
| Red meat (servings/day) | 4.8 | 4.3 | 3.8 | 4.8 | 4.2 | 3.4 |
BMI, body mass index; MET, metabolic equivalent; NSAID, non-steroidal anti-inflammatory
a
Quintiles of total activity in MET-h/wk: Q1 ≤ 8.2; Q3 19.1–33.5; Q5 ≥ 57.4
b
Quintiles of vigorous activity in MET-h/wk: Q1 0; Q3 4.1–10; Q5 >=28.1
c
Proportion of participants reporting ever having a sigmoidoscopy or colonoscopy during the study period from 1986–2004.
d
Proportion of participants reporting a physical examination in 1988, the first year this information was ascertained