AttendanceNCT07355569
The Effect on Attendance of an SMS Notification Prior to a Scheduled Screening Appointment in BreastScreen Norway
A study testing SMS notification in people with Attendance and Breast Cancer Screening, run by Norwegian Institute of Public Health at 1 site in Norway.
Trial summary
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. Read more about this study
- Who is it for?
- Ages 50 to 71 years, women onlyHealthy volunteers can take part
- Conditions the study is for
- Attendance, Breast Cancer Screening
- What is being tested?
- SMS notification
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 133,770 participants
- Where
- 1 siteNorway
- Study dates
- 10 Jan 2025to 31 Oct 2025
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 50 to 71 years
- Women only
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- women invited to BreastScreen Norway residing in the South-Eastern, Central, and Northern Norway Regional Health Authorities
Who cannot join
- no
Trial locations and contacts
1 site in 1 country.
About this study
Official title: 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.
- Conditions
- Attendance, Breast Cancer Screening
- Being tested
- SMS notification
- Keywords
- breast cancer screening, SMS notification, attendance
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
SMS notificationOther
Available in the NCCR and sent an SMS notification three or two days prior to a scheduled screening appointment
| Study group | Role | What they receive |
|---|---|---|
| Study group | Experimental | 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. Receives: Other: SMS notification |
| Control group | No intervention | 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 being measured
The primary outcome is the main question the study is designed to answer.
Screening attendance
Attendance after a routine or reminder invitation, with and without an SMS notification
Measured: 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.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Jan 2026
- Study start10 Jan 2025
- Primary completion31 Oct 2025
- Study completion31 Oct 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for AttendanceStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Screening
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- Simple 1:1 randomization
- Masking
- None (open label)
- Enrolment
- 133,770 participants (actual)
Sponsor and investigators
- Lead sponsor
- Norwegian Institute of Public Health
- Sponsor type
- Other government
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07355569
- Sponsor's protocol ID
- 5158-5158
- Status last verified
- Dec 2025
- First submitted
- 5 Jan 2026
- Last updated
- 23 Jan 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: 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.
Study at a glance
From the registry record, last updated by the sponsor on 23 Jan 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Sending SMS Notification Prior to a Scheduled Screening Appointment in BreastScreen Norway - the Effect on Attendance
- ClinicalTrials.gov ID
- NCT07355569
- Acronym / sponsor ID
- 5158-5158
- Conditions
- Attendance, Breast Cancer Screening
- Keywords
- breast cancer screening, SMS notification, attendance
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 133,770 participants (actual)
- Lead sponsor
- Norwegian Institute of Public HealthOther government
- Study start
- 10 Jan 2025 (actual)
- Primary completion
- 31 Oct 2025 (actual)
- Study completion
- 31 Oct 2025 (actual)
- First posted
- 21 Jan 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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 design
- Primary purpose
- Screening
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
- Model description
- Simple 1:1 randomization
| Arm | Type | Receives |
|---|---|---|
| Study group | Experimental | Other: SMS notificationThe 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. |
| Control group | No intervention | –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). |
Who may qualify
- Ages
- 50 to 71 years
- Sex
- Female only
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- women invited to BreastScreen Norway residing in the South-Eastern, Central, and Northern Norway Regional Health Authorities
Key exclusion criteria (1 listed)
- no
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| SMS notificationAvailable in the NCCR and sent an SMS notification three or two days prior to a scheduled screening appointment | Other | Study group |
Primary outcome
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
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 23 Jan 2026.
- Individual participant dataSharing planned: No. 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.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing SMS notification in people with Attendance and Breast Cancer Screening, run by Norwegian Institute of Public Health at 1 site in Norway.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 23 Jan 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Norway. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
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.). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 23 Jan 2026.