A significant percentage of R-rated dramas would earn more at the box office with a PG-13 rating, The Hollywood Reporter reported Tuesday.

Those findings come from a  study that compared the box-office performances of 400 R-rated and PG-13 films released between September 2005 and December 2007.

Nielsen’s analysis found that 34% of all R-rated drama titles would have performed better with a PG-13 rating, while about 17% of all comedies would benefit from a less restrictive rating.

In contrast, few horror movies would have achieved higher gross earnings with a PG-13 rating, according to the study.

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update: this full report is no longer available