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I do hope that the BMJ has not conceded over quintiles and quartiles
replacing fifths and quarters. This can cause no end of confusion since
there are only three quartiles and yet four quarters, so what would one
make of an expression
such as 'in the fourth quartile'? The median is the second quartile and
yet no-one would say they were 'in the median' which is what 'in the
second quartile' implies.