Table 1.
Study population demographics.
| Characteristic | Values (N = 108) |
|---|---|
| Age at the time of procedure (y), median (IQR) | 15.8 (8.3-17.6) |
| Sex, n (%) | |
| Female | 81 (75.6) |
| Race, n (%) | |
| Asian | 1 (0.9) |
| Black or African American | 15 (14.0) |
| White or Caucasian | 83 (77.6) |
| Multiracial | 1 (0.9) |
| Not known, unlisted | 7 (6.5) |
| Ethnicity, n (%) | |
| Hispanic/Latino | 20 (18.7) |
| Age at diagnosis, median (IQR) | 14.0 (7.7-16.3) |
| Blood type, n (%) | |
| A | 18 (16.8) |
| B | 4 (3.7) |
| AB | 0 (0) |
| O | 54 (50.5) |
| Unknown | 31 (29.0) |
| Diagnostic laboratory values,a median (IQR) | |
| FVIII (n = 108) | 90 (78-108.5) |
| VWF:Ag (n = 108) | 56 (48-62) |
| VWF:RCo (n = 108) | 41 (37.5-45) |
| VWF:GPIbM (n = 80) | 48 (43-54) |
| VWF:CB (n = 8) | 46 (41.75-52) |
| Isolated low VWF:RCo, n (%) | 33 (30.8) |
| Isolated low VWF:RCo, other functional level drawn, and normal, n (%) | 26 (24.3) |
| Number of times VWD levels drawn in the timeframe, median (IQR) | 2 (2-3) |
| Bleeding score, median (IQR) | 4 (3-5) |
Ag, antigen; CB, collagen binding; FVIII, factor VIII; GP, glycoprotein; RCo, ristocetin cofactor; VWD, von Willebrand disease; VWF, von Willebrand factor.
a
Earliest full set of diagnostic levels.