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Long working hours increase the risk of hypertension by almost  30 per cent, US research has shown. Analysis of working patterns and hypertension among 24,205 people aged 18 to 64 showed that those who worked 51 hours or more each week were 1.29 times more likely to have hypertension than those who worked fewer than 30 hours. Compared with people in professional occupations,  unskilled workers were 50 per cent more likely to develop hypertension (Hypertension Online).