Does personalising a study invitation letter by including a potential participants’ name and address improve study recruitment?

Study within a trial (SWAT) protocol. Investigating the effect of personalised versus non-personalised study invitations on recruitment: an embedded randomized controlled recruitment trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN18404129

Enrollment

Registered

2019-11-25

Start date

2020-03-02

Completion date

Unknown

Last updated

2022-11-21

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Recruitment to trials Not Applicable

Interventions

Children’s personal identification numbers will be obtained from the Swedish Childhood Cancer Registry (National Quality Registry) and linked to parents’ names and addresses via NAVET, a population re

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Parents of children diagnosed with cancer when aged 0-18 years, who have completed cancer treatment three months to five years previously, residing in Sweden

Exclusion criteria

Exclusion criteria: Does not meet inclusion criteria

Design outcomes

Primary

Measure	Time frame
The effectiveness of the personalised invitation letter compared with the standard invitation letter, defined as the recruitment rate, being the proportion of participants in each intervention group that are enrolled into the ENGAGE study.	—

Secondary

Measure	Time frame
The proportion of parents in each group: 1. Expressing an interest in participating in the ENGAGE study 2. Opting out of the ENGAGE study 3. Completing the reasons for non-participation questionnaire 4. Completing the eligibility interview 5. Completing the baseline assessment 6. Retained at (1) 12 weeks and (2) 6 months follow-up 7. Requiring a telephone reminder at (1) recruitment; (2) post-treatment (12 weeks); and (3) 6-months follow-up	—

Measure

Time frame

The proportion of parents in each group: 1. Expressing an interest in participating in the ENGAGE study 2. Opting out of the ENGAGE study 3. Completing the reasons for non-participation questionnaire 4. Completing the eligibility interview 5. Completing the baseline assessment 6. Retained at (1) 12 weeks and (2) 6 months follow-up 7. Requiring a telephone reminder at (1) recruitment; (2) post-treatment (12 weeks); and (3) 6-months follow-up

—

Countries

Sweden

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 19, 2026