Model for any donor reaction:
(1) body weight in pounds
(2) age in years
(3) number of previous donations
|
Number of Previous Donations
|
Points
|
|
none (first time)
|
1
|
|
1 or more
|
0
|
X =
= (-0.0162 * ((body weight) - 110)) - (0.0208 * ((age in years) - 17)) + (0.499 * (points for number of previous donations)) - 1.415
probability of a donor reaction =
= 1 / (1 + EXP((-1) * X))
The maximum risk for an adverse reaction is around 29%, which is seen in a 17 year old first time donor weighing 110 lbs. The minimum risk is seen an old, heavy multiple donor.
Additional models were prepared to predict the risk for:
(1) fatigue after the donation (higher risk in low weight females)
(2) soreness in the arm used for the donation (higher risk in a thin, young female)
(3) bruise at the venipuncture site (higher in Caucasian females)
