Table 2.

Details of data extracted from the studies

Section	Information to be collected
General information	Year of publication Title of article Authors Type of publication (journals, conference abstract, grey literature, etc.) PubMed ID (where applicable)
Study characteristics	Year of study Study design (cohort, case–control, experimental, case series) Country of study Age distribution Comments on method or quality of study
Pathogen characteristics	Infectious agent Species Subtype
Outcome data/results	Case definition Reported incubation period (individual data, mean, median mode and range) Derived or calculated summary estimates incubation period (raw data extracted) Source of calculated data (epidemic curve or author description)
Other outcome data	Incubation period to particular symptoms
Factors that could affect incubation period	No of exposed cases No of people affected Setting Mode of transmission Food vehicle (for foodborne infections only) Patient characteristics (e.g. previous infection or treatment, underlying illness)
Any other relevant information	Any other relevant information