Table 1.
Characteristics of platelet (n=100) and granulocyte donors (n=100).
| Characteristic | Platelet donors | Granulocyte donors | p-value* |
|---|---|---|---|
| Age (years) | 0.86 | ||
| <50 | 32% | 32% | |
| 50–59 | 40% | 44% | |
| 60–69 | 23% | 21% | |
| 70+ | 5% | 3% | |
| Sex | 0.04 | ||
| Female | 46% | 31% | |
| Race | 0.25 | ||
| Black | 3% | 0% | |
| White | 97% | 100% | |
| Diabetes | 1.00 | ||
| Yes | 3% | 2% | |
| Body mass index (kg/m2) | 0.67 | ||
| ≥26 | 51% | 55% | |
| Weight (kg) | 0.19 | ||
| Mean±SD | 84.2±15.0 | 81.2±16.6 | |
| Alcohol intake (average per day)† | 0.83 | ||
| ≥1 ½ oz | 14% | 12% | |
| Smoking (cumulative pack-years) | 0.52 | ||
| ≥ 10 | 24% | 29% | |
| Exposure to steroid medication‡ | 0.39 | ||
| None | 39% | 46% | |
| Moderate or high | 61% | 54% | |
| Number of granulocyte donations | |||
| <4 | 100% | 0% | N.A. |
| 4 – 10 | 0% | 41% | |
| 11 – 19 | 0% | 36% | |
| ≥20 | 0% | 23% | |
| Total apheresis donations, lifetime | 0.76 | ||
| Mean±SD | 78.83±55.94 | 92.38±57.07 | |
| Cumulative ocular sunlight exposure | 1.00 | ||
| High exposure | 3% | 4% | |
| Ocular risk factor index§ | 0.56 | ||
| At least one ocular risk factor | 14% | 18% | |
*
Exact likelihood ratio test of homogeneity if categorical; 2-sample t-test if continuous
†
Includes consumption of beer, wine, and/or liquor
‡
Derivation of risk level from steroid medication history. For skin, inhaled, oral, injected, and nasal, the risk level was based on the approximate total duration of steroid medication use.
§
History of any of the following: cataract, glaucoma, trauma, uveitis, or intraocular surgery (refractive, glaucoma, retinal laser, retinal detachment repair, or vitrectomy).