From Tony Diamond, Stanley, New Brunswick, Canada
You report that 594 million people had high blood pressure in 1975, but 1 billion did four decades later (19 November 2016, p 7). But in 1975 there were about 4 billion people on Earth; four decades later, 7.4 billion.
So the proportion of people with high blood pressure is about the same as it was in 1975.
The editor writes:
• We should perhaps have made room to point out that huge advances in preventing and treating high blood pressure have led to a decline in the developed nations – but not in poorer ones.
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