My ENT said 90% of people get better in a year, but he didn't have any data to back it up (i'm the sort of person who would ask these annoying followup questions!)
Among people who've had tinnitus for a while, how many had tinnitus and had it go away?
Also, what is the percentage of people who habituate?
So you got tinnitus twice in 4 years? After habituating to the first time?An even harder (and more useful) statistic would be recovery rates sorted out by cause.