TABLE 1.

Cohort characteristics

Characteristic
Number of donors	74 408
Sex, N (%)
Male	38 706 (52%)
Female	35 702 (48%)
Age at entry, mean (SD)	32.7 (11.5)
Total follow‐up, person‐years a	1 151 101
Follow‐up, N
0‐4 y	6199
5‐9 y	7642
10‐14 y	12 889
15‐19 y	29 155
20‐22 y	18 523
Apheresis donations, median (IQR)	8 (3‐23)

^a Ignoring censoring at event.