| Study name |
Effect of birthday cards with or without nudge on retention and data completion rates in trials involving children |
| Methods |
To determine whether sending a birthday card with or without a nudge improves retention and completion rates in trials involving children |
| Data |
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| Comparisons |
Intervention 1: Birthday card. Our PPI (patient and public involvement) group felt that the birthday cards should be as personal as possible but not have anything on the front that could be offensive. The front will therefore have the participant’s age and a gender neutral image linked to the trial. The message on the inside should be from someone they know, such as the treating clinician, or research nurse at their local site and the trial team. Intervention 2: Birthday card (as in intervention 1), but informed by nudge theory to encourage completion of questionnaires Intervention 3: No birthday card |
| Outcomes |
Primary: response rate to the participant follow‐up questionnaire at the first time point following receipt of the birthday card. Secondary: 1) Response rate to the participant follow‐up questionnaire at the 12‐month follow‐up: 2) Time to response (number of days from date due to date returned) 3) Completeness of primary outcome measure (defined as providing sufficient data to produce a valid summary score) 4) Need for a postal reminder 5) Cost per participant retained |
| Starting date |
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| Contact information |
mike.backhouse@york.ac.uk, adwoa.parker@york.ac.uk |
| Notes |
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