The results of the review were as follows:
The probability of compliance with the vaccination programme was 0.8.
The annual rate of decline of vaccine-induced antibody was 12%.
The probability of natural immunity against HAV was 10% (0-10 years), 15% (11-20 years), 18% (21-30 years), 35% (31-40 years), 45% (41-50 years), 70% (51-70 years), 75% (over 70 years).
The annual incidence of hepatitis A infection was 0.0001.
The case fatality rate for acute hepatitis A infection was 0.3 (under 50 years) and 2.5 (over 50 years).
The sensitivity and specificity of the screening test was 100%.
Quality of life associated with the states of well but susceptible, well with natural immunity, and well with vaccine-induced immunity were taken as unity.
A disutility of 30 days was attributed to an episode of acute hepatitis A.