The impact of computer-generated messages on childhood immunization coverage

Area of Science:

• Public Health
• Preventive Medicine
• Health Communication

Background:

• Computer-generated reminder/recall messages offer a cost-effective method to enhance childhood immunization provider office visits.
• This research evaluates the long-term effectiveness of these automated messages on immunization coverage within the first two years of life.

Purpose of the Study:

• To assess the sustained impact of computer-generated reminder messages on childhood immunization coverage.
• To determine the efficacy of different reminder strategies (telephone, mail, combined) in improving vaccination rates.

Main Methods:

• A randomized controlled trial was conducted in the Denver metropolitan area.
• 1227 infants aged 60-90 days, who had received initial doses of DTP and/or poliovirus vaccines, were included.
• Households were randomized into four groups: telephone/letters, telephone only, letters only, or no notification, receiving up to five phone calls and/or four letters per due immunization.

Main Results:

• Children receiving any intervention were 21% more likely to complete the immunization series by 24 months compared to the control group (49.2% vs. 40.9%).
• Group A (telephone and letters) showed a non-statistically significant 23% increase in series completion (50.2% vs. 40.9%).
• The cost per additional child completing the series in Group A was $226 (discounted to $79 after start-up costs).

Conclusions:

• Computer-generated communications, including phone calls and mailings, are effective in boosting immunization coverage for children under two years old.
• These automated contact methods, applied each time vaccines are due, significantly improve vaccination adherence.