Here follows my quick first thoughts of Roberts et al., 2020.

I predict this paper will generate much discussion over the coming weeks and months.

The link to the paper is here:

The authors studied 46 transwomen (TW) and 29 transmen (TM), majority in active service with the US Air Force.

Highly-active people, albeit not specifically-trained athletes. Mean age 26.6 yrs +/- 5.5 yrs.

Transgender officers were treated along standard hormone regimes. There is “documented suppression” of testosterone in TW but no raw numbers. Similarly, there are no raw numbers for TM.

USAF officers are subject to annual fitness tests, comprising push-up/sit-up reps per minute and a timed 1.5 mile run.

The performance of TW/TM over 30 months of treatment was retrieved from official records and compared with pre-treatment “baseline” performance.