A recent analysis of blood pressure measurements collected during longitudinal studies of samples of the general population in South Wales suggested that ageing plays no direct role in determining blood pressure levels (Miall and Lovell, 1967). The increases in blood pressure occurring during intervals of 8 to 10 years were found to be significantly related to the average pressure attained-the higher the pressure the greater the increase in pressure in a given time- and were only indirectly related to age.
Miall et al. (Mon,) studied this question.