Base case parameters used in the model.

a The average length of hospital stay was 11.40 days for subjects ≤18 years (paediatric) and 21.64 days for those >18 years (adult).b Disease incidences by age-class concerning Lombardia and Piemonte regions for the period 2007–2012 were calculated using the numbers of cases collected from the Italian Invasive Bacterial Diseases Surveillance System, the Italian Hospital Discharge Database and the age-specific population of the same period obtained from the Italian National Statistical Institute.c Data related to MenB case fatality rates and hospital costs were estimated from the Italian Hospital Discharge Dataset.d Population figures by single year of age and national mortality rates at January 1, 2012, were obtained from the Italian National Statistical Institute.e Routine immunisation vaccine coverage was assumed similar to the actual one against meningococcal serogroup C in Lombardia and Piemonte regions.Base case parameters used in the model.