Related Experiment Video
Updated: Mar 1, 2026
Measuring Delay Discounting in Humans Using an Adjusting Amount Task
Published on: January 9, 2016
The association between interval from acceptance to first-time donation, missed first appointment and future donation
S A Mousavi1, B Hermundstad1, T R Knutsen1
1Department of Immunology and Transfusion Medicine, Akershus University Hospital, University of Oslo, Lørenskog, Norway.
Background And Objectives:
We examined the association of the interval between the date an individual is accepted for blood donation and the date of first donation (IFD-interval, index-to-first-time donation interval) and missed first appointment with future donation behaviour among new donors. These two variables have not been analysed in previous studies of donation behaviour among new donors.
Methods:
Categories were generated for age (18-29 vs 30-65 years), missed-appointment status (no-show vs same-day cancellation) and the IFD-interval [short (≤median time) vs long (>median time)]. Accepted donors (n = 807) were followed for 19 months. Outcome measures were first-appointment attendance rates, return rates among first-time donors and the proportion of experienced donors, defined as those who gave ≥5 donations.
Results:
In logistic regression analyses, high no-show rates were significantly associated with decreased likelihood of first-time donation. Long IFD-intervals were significantly associated with decreased likelihood of returning for a second donation among first-time donors. Experienced donors, compared to novice donors, were more likely to be male than female, older than younger and with shorter vs longer IFD-intervals.
Conclusions:
No-show and long IFD-intervals may be behavioural markers of low levels of motivation for making the first donation and for returning for a second donation, respectively.
More Related Videos
05:40The Motivation for Alcohol Reward: Predictors of Progressive-Ratio Intravenous Alcohol Self-Administration in Humans
Published on: April 28, 2022
05:16Cutoff Value of Phase Angle by Bioelectrical Impedance Analysis at Admission as a Prognostic Factor in Patients with Acute Heart Failure
Published on: June 10, 2025
Related Concept Videos
01:08Timing and Consequences on Behavior
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant...
01:03Prediction Intervals
However, the point estimate is most likely not the exact value of the population parameter, but close to it. After calculating point estimates, we construct interval estimates, called confidence intervals or prediction intervals. This prediction interval comprises a range of values unlike the point estimate and is a better predictor of the observed sample value, y.
01:28Kidney Transplant I: Introduction
01:18Introduction To Survival Analysis
The primary goal of survival analysis is to estimate survival time—the time...
02:20Longitudinal Research
01:20Actuarial Approach
Consider the example of a high-risk surgical procedure with significant early-stage mortality. A two-year clinical study is conducted,...