Of gender-affirming surgical procedures identified among adults and minors, 1591 of 2664 (59.7%) and 82 of 85 (96.4%) were chest-related procedures, respectively.
This first part parses to me as "Of gender-affirming surgical procedures identified, 1591 of 2664 adult surgeries (59.7%) and 82 of 85 minor child surgeries (96.4%) were chest-related procedures, respectively." However, the next sentence doesn't seem to line up with that notion...
Of the 636 breast reductions among men, 507 (80%) were performed on cisgender men. Of the 151 breast reductions among boys, 146 (97%) were performed on cisgender boys (Figure 2).
To make this section easier to read, I replaced some words and phrases while hopefully keeping the meaning intact.
I kind of feel like this quote is referencing two different data sets, and is missing a segue. The numbers don't seem to line up with each other any way I poke at them.
I hadn't clicked the link yet, but Concrete Donkey told me what it was immediately