Ahealthysystolicbloodpressureis120 mm Hg or less.Astudytookavolunteersampleof subjectswithhigh-bloodpressureandaskedthemtowalkfor30minutesatlunchtimeeach day.Afteronemonth,theirmeansystolicbloodpressurefellfrom150to140.Explainhowthis could merelyreflectregressiontowardthemean.

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Ahealthysystolicbloodpressureis120 mm Hg or less.Astudytookavolunteersampleof subjectswithhigh-bloodpressureandaskedthemtowalkfor30minutesatlunchtimeeach day.Afteronemonth,theirmeansystolicbloodpressurefellfrom150to140.Explainhowthis could merelyreflectregressiontowardthemean.

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