There is anecdotal evidence that the use of nitrox reduces postdive fatigue particularly in older and or obese divers however the only known study to test this found no statistically significant reduction in reported fatigue

What is the correctly punctuated version of this sentence?
There is anecdotal evidence that the use of nitrox reduces post-dive fatigue particularly in older and or obese divers, however the only known study to test this found no statistically significant reduction in reported fatigue.