If you've been comparing hyperbaric oxygen therapy (HBOT) options, you've probably noticed that chambers are marketed at different pressure levels — most commonly 1.3 ATA and 1.5 ATA. At first glance, a jump of 0.2 ATA might not sound like much. But in hyperbaric medicine, pressure isn't just a number on a dial — it's the entire mechanism that drives how much oxygen actually reaches your tissues. Understanding this difference matters if you're deciding where to invest your ti