The median change was approximately 4 cm (1.5 inches). if the change was less than 4 cm you were determined to be a shower, greater than 4 cm was determined to be a Grower. 26% of men were growers, 74% were showers. Growers were found to be significantly younger and single. There was No Correlation with race, smoking history, comorbidities or ... More @Wikipedia
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