In a 2021 study, four radiologists, blinded to the ear phenotype, assessed radiographs of 22 Scottish Fold/Straight cats. All cats were genotyped showing the heterozygous mutation in all folded ear cats but not in straight cats. Each reviewer gave on average the folded ear cats a worse "severity score", however the images showed much milder signs than previously published. The authors state that the severity of OCD in heterozygous cats is very variable and subtle. This could be due to other modifier genes or nurture (climate, diet, exercise). So it was shown that the least affected folded ear cat was given identical or less score than the highest rated straight ear cat.
In a 2021 study four radiologists blinded to the ear phenotype assessed radiographs of 22 Scottish Fold/Straight cats All cats were genotyped showing the heterozygous mutation in all folded ear cats but not in straight cats Each reviewer gave on average the folded ear cats a worse "severity score" however the images showed much milder signs than previously published The authors state that the severity of OCD in heterozygous cats is very variable and subtle This could be due to other modifier genes or nurture (climate diet exercise) So it was shown that the least affected folded ear cat was given identical or less score than the highest rated straight ear cat