Blood pressure was measured in 3317 men, aged 40-59, working in H. Cegielski Metal Works in Poznań. The average systolic pressure for the whole population was 130.9 mmHg (SE = 17.90). The average diastolic pressure was 83.7 mmHg (SE = 10.03). The systolic, diastolic and mixed systolic-diastolic hypertension was found in 539 men which makes 16.3% of the study group. The borderline systolic hypertension was found in 327 men i.e. 9.9%, borderline diastolic hypertension in 267 men i.e. 8.0%. Both systolic and diastolic borderline hypertension displayed 339 men i.e. 10.2% of the study group. So, borderline hypertension (systolic, diastolic and systolic-diastolic) was found in 933 men which makes 28.1% of the population under the study.