Table 1.
Key characteristics of studies included in review of BMI and all cause mortality in never smokers and all participants
| Never smokers | All participants | |
|---|---|---|
| No of studies (risk estimates) | 53 (44) | 228 (198) |
| No of deaths | >738 144 | >3 744 722 |
| No of participants | >9 981 558 | 30 233 329 |
| No of studies (risk estimates) by geographical location: | ||
| North America | 22 (20) | 70 (67) |
| South America | 0 (0) | 3 (3) |
| Europe | 18 (11) | 96 (69) |
| Australia | 2 (2) | 9 (9) |
| Asia | 11 (11) | 49 (49) |
| Pacific | 0 (0) | 1 (1) |
| No of studies (risk estimates) by study size: | ||
| <1000 | 2 (2) | 15 (12) |
| 1000-<10 000 | 13 (13) | 92 (90) |
| 10 000-<100 000 | 20 (18) | 89 (71) |
| 100 000-<1 000 000 | 14 (7) | 20 (20) |
| ≥1 000 000 | 1 (1) | 12 (5) |
| Missing | 3 (3) | 0 (0) |
| Range of study size | 441-7 436 748 | 162-12 832 637 |
| Mean, median | 243 453, 20 346 | 152 694, 8876 |
| Duration of follow-up: | ||
| Range of follow-up (years) | 3.9-35 | 2-42 |
| Mean, median (years) | 14.2, 12 | 13.8, 12 |