| USTS secondary analysis (Almazan et al., 2021) |
| Association between prior gender-affirming surgery and lower odds of psychological distress, tobacco use, and suicidal ideation; limitations: self-report, nonprobability sampling, potential confounding |
| Systematic reviews (Wernick 2019; Oles et al. 2022; Hayes reports) |
| Most studies suggest psychological benefits (quality of life, body image) after GAS but overall evidence limited by heterogeneous measures, retrospective designs, and low-moderate quality |
| Phalloplasty outcomes systematic review (Wang et al., 2022) |
| High overall complication rates (e.g., urethral fistula/stricture); functional outcomes variably reported; evidence weak and lacking standardized outcomes |
| Metoidioplasty vs RFFP systematic review (Frey et al., 2016) |
| Metoidioplasty may have higher single-stage completion, better aesthetic and erogenous sensation, and lower complication rates vs RFFP; evidence low to very low quality |
| Vaginoplasty reviews (Horbach et al., 2015; Bouman et al., 2014; Bustos et al., 2021) |
| Techniques heterogeneous; neovaginal/introital stenosis common; satisfaction often high but outcome measures inconsistent and studies mostly retrospective/low quality |
| Hair removal evidence (Zhang 2016; Hayes evolving review) |
| Limited data; LHR moderately effective and satisfactory when appropriately selected; not guaranteed permanent; better results if no prior mechanical epilation |
| Facial feminization and body-contouring (Hayes, Coon et al., Siringo et al.) |
| Limited, mostly poor-quality studies suggesting potential improvements in satisfaction and quality of life; lack of standardized patient-reported measures and long-term data |
| Adolescents evidence (Hayes reviews; Thompson; Mahfouda) |
| Evidence scarce for adolescents; chest surgery may have psychological benefits but genital GAS safety/efficacy and long-term outcomes unclear; recommendations emphasize case-by-case multidisciplinary assessment |
| Policy procedural and coverage rationale (UnitedHealthcare CS145.R) |
| Lists covered procedures, documentation requirements, age and hormone therapy thresholds, and notes policy exclusion for certain states (e.g., Maryland); emphasizes federal/state/contractual determinations |