The Effect on Attendance of an SMS Notification Prior to a Scheduled Screening Appointment in BreastScreen Norway

January 21, 2026 updated by: Norwegian Institute of Public Health

Sending SMS Notification Prior to a Scheduled Screening Appointment in BreastScreen Norway - the Effect on Attendance

This study has been designed as a randomized controlled trial including women invited to a national screening program for breast cancer in Norway, BreastScreen Norway in 2025. The program invites women aged 50-69 to biennial screening mammography. The study includes two substudies with the intervention of sending an SMS notification three days prior to the screening appointment in the first substudy and two days prior to the screening appointment in second study. The comparison is made between the study groups, where women are sent an SMS notification two or three days prior to their scheduled screening appointment and the control groups where women will not be sent an SMS notification about a scheduled screening appointment.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

133770

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Norway
    • Oslo County
      • Oslo, Oslo County, Norway, 222
        • Norwegian Institute of Public Health

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • women invited to BreastScreen Norway residing in the South-Eastern, Central, and Northern Norway Regional Health Authorities

Exclusion Criteria:

  • no

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Screening
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Study group

The intervention was an SMS notification sent before the scheduled appointment for mammographic screening. Women in the study group was linked to the Common Contact Register in Norway (CCRN) to obtain phone numbers for sending SMS notification prior to the scheduled appointment. Phone numbers are registered in CCRN when users log into public online services through an electronic ID. Inclusion in this registry is voluntary. The personal identification number of the women in the study group was used to obtain their phone number.

In study group 1 women were linked to the CCRN and those registered were sent an SMS notification three days prior to the scheduled routine screening appointment during January-March 2025. Women in study group 2 were sent an SMS notification two days prior to the scheduled routine screening appointment during April-June 2025.
Other: SMS notification
Available in the NCCR and sent an SMS notification three or two days prior to a scheduled screening appointment
No Intervention: Control group
Women in the control group did not receive any SMS notification before the scheduled appointment to mammographic screening. The women in the control group were not linked to the NCCR and were not available or sent an SMS notification during the study periods, January-March 2025 (control group 1) and women who were not sent an SMS notification during April-June 2025 (control group 2).

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Screening attendance
Time Frame: Three months (180 days) after scheduled date for a screening examination following a routine invitation or three months (180 days) after a reminder was posted.
Attendance after a routine or reminder invitation, with and without an SMS notification
Three months (180 days) after scheduled date for a screening examination following a routine invitation or three months (180 days) after a reminder was posted.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Norwegian Institute of Public Health

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 10, 2025

Primary Completion (Actual)

October 31, 2025

Study Completion (Actual)

October 31, 2025

Study Registration Dates

First Submitted

January 5, 2026

First Submitted That Met QC Criteria

January 12, 2026

First Posted (Actual)

January 21, 2026

Study Record Updates

Last Update Posted (Actual)

January 23, 2026

Last Update Submitted That Met QC Criteria

January 21, 2026

Last Verified

December 1, 2025

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 5158-5158

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Research data, including participant data used can only be requested from https://helsedata.no/, given the legal basis in Articles 6 and 9 of the GDPR and that the processing is in accordance with Article 5 of the GDPR, as well as Norwegian legislation.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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