Evidence map›Paper›PMID 29304734›Full record

Trial reportBMC medical research methodology2018

Effects of pre-notification, invitation length, questionnaire length and reminder on participation rate: a quasi-randomised controlled trial.

Marie Koitsalu, Martin Eklund, Jan Adolfsson, Henrik Grönberg, Yvonne Brandberg

Abstract readRandomized Controlled Trial
In one paragraph

Trial report in BMC medical research methodology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

25 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Methods to increase response to postal and electronic questionnaires.The Cochrane database of systematic reviews · 2023
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  11. Aftercare following fatal traumatic injuries, needs and questions: a level 1 trauma center study and scoping review.European journal of trauma and emergency surgery : official publication of the European Trauma Society · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Marie KoitsaluDepartment of Oncology-Pathology, Karolinska Institutet. Karolinska University Hospital, Z1:00, 171 76, Stockholm, Sweden. marie.koitsalu@ki.se.ORCID 0000-0002-8589-9187
Martin EklundDepartment of Medical Epidemiology and Biostatistics, Karolinska Institutet, Boxes 281, 171 77, Stockholm, Sweden.
Jan AdolfssonDepartment of Clinical Science Intervention and Technology, Karolinska Institutet, 171 77, Stockholm, Sweden.
Henrik GrönbergDepartment of Medical Epidemiology and Biostatistics, Karolinska Institutet, Boxes 281, 171 77, Stockholm, Sweden.
Yvonne BrandbergDepartment of Oncology-Pathology, Karolinska Institutet. Karolinska University Hospital, Z1:00, 171 76, Stockholm, Sweden.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundImproving participation rates in epidemiologic studies using questionnaires and biological sampling is important for the generalizability of the outcome. The aim of this study was to examine the effects of pre-notification, invitation length, questionnaire length, and reminder on participation rate and to investigate whether some factors contributed to participants doing both the questionnaire and blood sampling as oppose to only one part.

methodsOur study was embedded within the pilot testing of a large population-based study about prostate cancer screening. Our study sample consisted of 28.134 men between 50 and 69 years of age and living in the region of Stockholm (Sweden) invited to respond to a web-based questionnaire and to provide blood for prostate cancer testing. The men were randomly allocated according to birth of date to receive either: (a) a pre-notification postcard or not; (b) a shorter or a longer invitation letter; (c) a shorter or a longer web-based questionnaire, and (d) a reminder or not. The effects of the survey design factors were tested using chi-square.

resultsThe use of a pre-notification (p < 0.0001), a longer questionnaire (p = 0.004) and the use of a reminder (p = 0.02) were associated with an increase in overall participation, i.e. responding to the questionnaire or providing blood for PCT or performing both components.

conclusionsThe results of this pilot study justified the use of a pre-notification and a reminder in the following large population based study since the benefits of increased participation traded off against the greater costs incurred. Furthermore, we were able to use the longer version of the questionnaire, which allowed us to collect more information without risking a lower response rate.

Indexed as

Reminder SystemsSurveys and QuestionnairesAgedHumansInternetMaleMass ScreeningMiddle AgedPatient ParticipationPilot ProjectsProstatic NeoplasmsReproducibility of ResultsResearch DesignSwedenInvitation letterParticipation ratePre-notificationQuestionnaire lengthReminderResponse rate

Identifiers

PMID29304734
PMCPMC5756335

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.