Table 4.
Population attributable fractions estimated using body mass index at time of survey and body mass index at maximum
| |
BMI, time of survey |
BMI, maximum |
||||
|---|---|---|---|---|---|---|
| BMI category (kg/m 2 ) | Pd (%) | HR | PAF (%) | Pd (%) | HR | PAF (%) |
| Normal |
29.77 |
1.00 |
0 |
11.76 |
1.00 |
0 |
| Overweight |
36.64 |
0.98 |
-0.75 |
32.92 |
1.28 |
7.20 |
| Obese class 1 |
21.11 |
1.18 |
3.22 |
31.50 |
1.67 |
12.64 |
| Obese class 2 |
12.47 |
1.31 |
2.95 |
23.82 |
2.15 |
12.74 |
| Total | 5.42 | 32.58 | ||||
BMI: body mass index; Pd: proportion exposed among decedents (%); HR: hazard ratio; PAF: population attributable fraction. See Table 1 for definitions of BMI categories. The PAF for each exposure category is calculated using Equation 1 in the text. PAFs are summed across exposure categories to obtain the overall PAF. Calculations are based on the sample of never-smoking adults ages 50-84.