The blood pressure was measured in the lying position and after I minute's quiet standing in 494 people aged 65 or more living at home. A drop of 20 mmHg or more in systolic pressure occurred on standing in 24 per cent, of 30 mmHg or more in 9 per cent, and of 40 mmHg or more in 5 per cent. The frequency of a fall on standing increased with age.
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Caird et al. (1973) studied this question.
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