The control group could hear sounds much better (more loudly) then the group of people who had been exposed to the arsenic ...
I would say the control group could still hear the sound better even if it was less loud (the quietest sound they were able to hear was quieter) - but that doesn't mean they heard sounds louder ...
Your explanation is more correct then my statement.
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30 Best Steemit Bloggers Of The Day To Follow 3rd August 2017
https://steemit.com/steemit/@jzeek/30-best-steemit-bloggers-of-the-day-to-follow-3rd-august-2017
Very kind of you :)