In contrast, Gustavsson and coworkers (1996) studied cases of MI in professional drivers
aged 30–74 in Stockholm County (4105 cases and 13,066 referents) during 1976–1984.
Incident cases of first MI were identified using a central register. Referents were selected
from the general population and matched based on age, year of admission, and death.
National census data on occupation and industry was used to identify long-term drivers. The
relative risk of MI was 1.53 (95% CI ¼ 1.15–2.05) for bus drivers (70 cases), 1.65 (95%
CI ¼ 1.30–2.11) for taxi drivers (101 cases), and 1.31 (95% CI ¼ 1.05–1.64) for longdistance
truck drivers (112 cases).