This study investigates the psychological effects of blood donation among adult donors at the Guangzhou Blood Center. The primary objective is to examine whether a brief gratitude-based intervention delivered after donation enhances donors' subjective well-being (SWB) and basic psychological need (BPN) satisfaction. Participants who complete a whole-blood donation are randomly assigned to either an Intervention group, receiving a standardized gratitude reinforcement message accompanied by a vignette emphasizing the life-saving impact of donation, or a Control group that receives no additional message. All participants complete questionnaires at Time 1 (immediately after donation) and at Time 2 (4-22 days later), assessing SWB and related psychosocial variables.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Enrollment
601
A reminder to inform donors that their blood has saved patient's life in a questionnaire.
Guangzhou Blood Center
Guangzhou, Guangdong, China
Score of Subjective Well-Being at Time 2
Subjective well-being (SWB) is assessed at follow-up using a validated multi-item measure capturing life satisfaction and affective well-being. Affect-Adjective Scale (validated Chinese version): 9 items, each scored 1-7. Satisfaction with Life Scale (validated Chinese version): 5 items scored 1-7. An aggregate SWB score was calculated by standardizing and summing life satisfaction scores with positive affect scores and subtracting the negative affect score from them. Scores range from low to high levels of well-being. The primary objective is to evaluate whether exposure to the gratitude-based intervention leads to higher SWB relative to the control condition.
Time frame: 4-22 days after donation
Score of Subjective Well-being at Time 1
Baseline Subjective well-being (SWB) is measured using a validated multi-item measure capturing life satisfaction and affective well-being. Affect-Adjective Scale (validated Chinese version): 9 items, each scored 1-7. Satisfaction with Life Scale (validated Chinese version): 5 items scored 1-7. An aggregate SWB score was calculated by standardizing and summing life satisfaction scores with positive affect scores and subtracting the negative affect score from them. Scores range from low to high levels of well-being.
Time frame: Immediately after donation
Score of Basic Psychological Needs Satisfaction at Time 1
Baseline basic psychological needs (BPN) satisfaction is measured using a 9-item Basic Psychological Needs Scale (validated Chinese version). The scale contains subscales for autonomy, competence, and relatedness, using a 7-point scale ranging from 1 (not at all true) to 7 (very much true). Each of the three subscales was averaged to form an index of general BPN satisfaction. This measure captures donors' immediate psychological experience following donation. Higher scores indicate greater psychological need satisfaction.
Time frame: Immediately after donation
Score of Basic Psychological Needs Satisfaction at Time 2
The same basic psychological needs satisfaction (BPN) scale is administered at follow-up to examine changes after the intervention. It is measured using a 9-item Basic Psychological Needs Scale (validated Chinese version). The scale contains subscales for autonomy, competence, and relatedness, using a 7-point scale ranging from 1 (not at all true) to 7 (very much true). Each of the three subscales was averaged to form an index of general BPN satisfaction. Higher scores indicate greater psychological need satisfaction.
Time frame: 4-22 days after donation
Score of Blood Donation Intention at Time 1
Intention to donate blood again in the future at Time 1 is measured using a single self-report intention item rated from 1 (very unlikely) to 7 (very likely), with higher scores indicating stronger intention to donate. The same item is administered at Time 1 and Time 2 to assess changes over time and to examine potential effects of the intervention on future donation motivation.
Time frame: Immediately after donation
Score of Blood Donation Intention Score at Time 2
Intention to donate blood again in the future at Time 2 is measured using a single self-report intention item rated from 1 (very unlikely) to 7 (very likely), with higher scores indicating stronger intention to donate. The same item is administered at Time 1 and Time 2 to assess changes over time and to examine potential effects of the intervention on future donation motivation.
Time frame: 4-22 days after donation
Re-Donation Rate within One Year
Actual re-donation rate is obtained from the Guangzhou Blood Centre's donation records. The variable indicates whether the participant returned for another whole-blood or component donation within one year.
Time frame: Up to 12 months after the initial donation
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