FIG. 1.

Three‐year effect sizes of assessment metrics in preHD populations from ENROLL‐HD. cUHDRS, composite Unified Huntington's Disease Rating Scale; PIN, prognostic index; preHD, prediagnosis Huntington's disease; SDMT, Symbol Digit Modalities Test; Stroop‐C, Stroop Color and Word Test (color condition); Stroop‐I, Stroop Color and Word Test (interference condition); Stroop‐W, Stroop Color and Word Test (word condition); TFC, total functional capacity; TMS, total motor score; Trail‐A, trail making test part A; Trail‐B, trail making test part B; Verbal‐C, categorical verbal fluency test; Verbal‐L, letter verbal fluency test.