Distribution of age by study and sex
| BHDPP (n=10 064) | BIRNH (n=11 031) | MONICA (n=4873) | BELSTRESS (n=21 390) | Total sample (n=47 358) | |
| Men | |||||
| 25–34 years | – | 1042 | 578 | – | 1620 |
| 35–44 years | 1780 | 1254 | 580 | 6520 | 10 234 |
| 45–54 years | 6215 | 1262 | 636 | 8471 | 16 584 |
| 55–64 years | 2069 | 1292 | 635 | 1321 | 5321 |
| 65–74 years | – | 962 | – | – | 962 |
| Total | 10 064 | 5816 | 2529 | 16 312 | 34 731 |
| Women | |||||
| 25–34 years | – | 1948 | 549 | – | 1497 |
| 35–44 years | – | 1224 | 625 | 2739 | 4588 |
| 45–54 years | – | 1244 | 599 | 2088 | 3931 |
| 55–64 years | – | 1081 | 571 | 251 | 1903 |
| 65–74 years | – | 718 | – | – | 718 |
| Total | – | 5215 | 2344 | 5078 | 12 637 |
BELSTRESS, Belgian jobstress project; BHDPP, Belgian heart disease prevention project; BIRNH, Belgian interuniversity research on nutrition and health study; MONICA, monitoring trends and determinants in cardiovascular disease.