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

NCT07355569 | Completed

• 1 other identifier: 5158-5158
• Study Type: interventional
• Target: 133,770
• Locations: 1 country
• Sites: 1

Brief 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. 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

Keywords

breast cancer screening; SMS notification; attendance

Outcome Measures

Primary Outcomes (1)

• Screening attendance

  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.

Study Arms (2)

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.

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).

Interventions

SMS notification OTHER

Available in the NCCR and sent an SMS notification three or two days prior to a scheduled screening appointment

Study group

Eligibility Criteria

• Age: 50 Years - 71 Years
• Sex: female
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

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

Sponsors & Collaborators

• Norwegian Institute of Public Health: lead

Study Sites (1)

Norwegian Institute of Public Health

Oslo, Oslo County, 222, Norway

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: SCREENING
• Intervention Model: PARALLEL
• Sponsor Type: OTHER GOV
• Responsible Party: SPONSOR

Model Details: Simple 1:1 randomization

Study Record Dates

• First Submitted: January 5, 2026
• First Posted: January 21, 2026
• Study Start: January 10, 2025
• Primary Completion: October 31, 2025
• Study Completion: October 31, 2025
• Last Updated: January 23, 2026

Record last verified: 2025-12

Data Sharing

• IPD Sharing: Will not share

Locations

NO (1)