Table 1.

Participant characteristics

	n (%)
Total participants	481
Sex
Male	108 (22.5)
Female	371 (77.1)
Participants with VWF:Ag	478 (99.4)
Participants with VWF:RCo	401(83.4)
Participants with VWF:GpIbM	38 (7.9)
Participants with information on estrogen use	459
No use at either time point	343 (74.7)
Use at both time points	32 (7.0)
Use at first time point only	23 (5.0)
Use at second time point only	61 (13.3)
Initial VWF:Ag >100%	182/478 (38)
Initial VWF:RCo >100%	101/401 (25)
Initial VWF:GpIbM >100%	13/38 (34)

	n (SD)
Mean age, y
First laboratory time point	11 (5.5)
Second laboratory time point	12.3 (5.5)
Average time between laboratory draws, d	467 (794)
Median hemoglobin first time point, g/dL	11.6 (2.7)
Median hemoglobin second time point, g/dL	12.6 (2.3)
Median change in hemoglobin between draws, g/dL	0.9 (2.6) (range, −6.5 to 11.0)

SD, standard deviation.