Size‑adjustments can mask male advantage

Studies comparing transwomen to women sometimes normalize performance by body mass or size, which can mathematically erase the very sex‑linked advantages (height, lean mass, absolute power) under debate. Policymakers should require preregistered, sport‑relevant absolute metrics (times, distances, watts) and transparent adjustment rationales before using such studies to set eligibility rules. — Clarifying how normalization choices flip conclusions improves evidence standards for sex‑category policy and prevents media from amplifying misleading 'parity' claims.