Demographics summary statistics at baseline
| Median age (range), y | 18.0 (5-59) |
| Sex, n (%) | |
| Female | 31 (68.9) |
| Male | 14 (31.1) |
| Race/ethnicity, n (%) | |
| Asian | 2 (4.4) |
| Black or African American | 3 (6.7) |
| Hispanic or Latino | 6 (13.3) |
| Native Hawaiian or other Pacific Islander | 1 (2.2) |
| White | 32 (71.1) |
| Unknown | 1 (2.2) |
| Diagnosis combination, n (%) | |
| Venous | 32 (71.1) |
| Venous, other | 3 (6.7) |
| Capillary, overgrowth, PI3KCA, venous | 1 (2.2) |
| Lymphatic, overgrowth, venous | 1 (2.2) |
| Capillary, overgrowth, venous | 1 (2.2) |
| Lymphatic, venous | 1 (2.2) |
| PTEN | 1 (2.2) |
| Capillary, lymphatic, other, overgrowth, venous | 1 (2.2) |
| Capillary, lymphatic, other, venous | 1 (2.2) |
| Lymphatic | 1 (2.2) |
| Overgrowth, PI3KCA, venous | 1 (2.2) |
| Capillary, lymphatic | 1 (2.2) |
| Median age (range), y | 18.0 (5-59) |
| Sex, n (%) | |
| Female | 31 (68.9) |
| Male | 14 (31.1) |
| Race/ethnicity, n (%) | |
| Asian | 2 (4.4) |
| Black or African American | 3 (6.7) |
| Hispanic or Latino | 6 (13.3) |
| Native Hawaiian or other Pacific Islander | 1 (2.2) |
| White | 32 (71.1) |
| Unknown | 1 (2.2) |
| Diagnosis combination, n (%) | |
| Venous | 32 (71.1) |
| Venous, other | 3 (6.7) |
| Capillary, overgrowth, PI3KCA, venous | 1 (2.2) |
| Lymphatic, overgrowth, venous | 1 (2.2) |
| Capillary, overgrowth, venous | 1 (2.2) |
| Lymphatic, venous | 1 (2.2) |
| PTEN | 1 (2.2) |
| Capillary, lymphatic, other, overgrowth, venous | 1 (2.2) |
| Capillary, lymphatic, other, venous | 1 (2.2) |
| Lymphatic | 1 (2.2) |
| Overgrowth, PI3KCA, venous | 1 (2.2) |
| Capillary, lymphatic | 1 (2.2) |
PI3KCA, phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit α; PTEN, phosphatase and tensin homolog.