Student or Learner
I've found the following:
1. The other news is that there is a 50% decrease of 20 to 40-year-old adults with serious gum problems.
I'm not sure about what this sentence means.
Does #1 mean the following?
2. The other news is that there is a 50% decrease in the number of adults from 20 to 40 years old with serious gum problems.
If so, is the phrase "decrease of ..." common?
If not, would you let me know the meaning of #1?
Thank you very much in advance for your help on this.