Hannerz H, et al. - Whether incidences of ischemic heart disease (IHD) and use of antihypertensive drugs were independent of weekly working hours (WWH) among full-time employees was tested in Denmark. By means of a random selection process, the members were chosen from the target population of all full-time employees in Denmark. Researchers used Poisson regression to model incidence rates as a function of WWH. Three thousand, six hundred thirty-five cases of IHD and 20,648 cases of antihypertensive drug usage was found. No statistically significant association was found between WWH and IHD or antihypertensive drug usage in this Danish sample.