Investigating Affective Attitude Question-behaviour Effects on Intention to Become an Organ Donor

Study Overview
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Brief Summary
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The investigators aim to experimentally manipulate presence of questions on positive or negative affective attitudes to see if including these moderate as intention to become an organ donor. The methodology will be replicated across three international sites (RCSI Dublin, RCSI Bahrain, RCSI Perdana University).

Official Title
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Circumventing the 'Ick' Factor: a Multi-site Randomised Trial of the Effects of Omitting Affective Attitudes to Increase Intention to Become an Organ Donor

Conditions
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Organ Donation

Intervention / Treatment
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* Behavioral: Question-behaviour effect (for affective attitudes)
* Behavioral: Question-behaviour effect (negatively-worded attitudes)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Agree to participate Exclusion Criteria: Refuse to participate

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| No Intervention: Replication group<br>Replication group - this group will complete the entire questionnaire, in order to replicate the findings of O'Carroll et al (2011) | |
| Active Comparator: Omit affective attitudes<br>Omitting affective attitudes The intervention is the omission of all questions on affective attitudes. This group will complete a similar questionnaire to the replication group, with the same number of questionnaire items, but affective attitudes will be omitted. Dummy questions (e.g. about politics) will be substituted for these deleted questions. | Behavioral: Question-behaviour effect (for affective attitudes)<br>* Investigators propose to investigate the Question-behaviour effect (omit affective attitudes). Investigators will conduct an experimental manipulation by omitting certain items from a questionnaire assessing attitudes to organ donation. Specifically, investigators will omit questions on affective attitudes. This group will complete a similar questionnaire to the comparison group, with the same number of items, but items on affective attitudes will substituted for non-affective items (e.g. on political parties).<br>* Other names: Priming;|
| Active Comparator: Omit negatively-worded items<br>Omitting negatively-worded affective attitudes. This intervention is the omission of a subset of negatively-worded affective attitudinal items. This group will complete a similar questionnaire to the replication group, with the same number of items, but all negatively-worded affective attitudes will be omitted. Dummy questions (e.g. about politics) will be substituted for these deleted questions. | Behavioral: Question-behaviour effect (negatively-worded attitudes)<br>* Behavioral: Question-behaviour effect (for negatively-worded attitudes) Investigators propose to investigate the Question-behaviour effect (omit negatively-worded affective attitudes). Investigators will conduct an experimental manipulation by omitting certain items from a questionnaire assessing attitudes to organ donation. Specifically, investigators will omit questions on negatively-worded affective attitudes. This group will complete a similar questionnaire to the comparison group, with the same number of items, but items on negatively-worded affective attitudes will substituted for non-affective items (e.g. on political parties).<br>* Other names: Priming;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Intention to become an organ donor | Mean score of two 7-point items: I will definitely sign up for organ donation and discuss this with my family in the next few months and How strong is your intention to sign up for organ donation and discuss this with my family in the next few months? | within 3 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Taking a donor card after the interview | Did survey participant accept a donor card? Yes/No | Immediately at the end of the interview (i.e. that day, an average of 10-15 minutes after consenting to participate)) |