Table 3.

Principal components analysis

	Proportion %	Variables related significantly
Principal component 1	40.2	GLOBAL, genome (RNA), envelope (absent), contact (common), respiratory (common), fecal-oral (common), sexual (no), blood (no), vertical (no), incubation period (short), infectious period (short), persistent (no), reinfection (frequent), annual incidence (high), seroprevalence (high), seasonality (existence)
Principal component 2	13.4	GLOBAL, genome (DNA), contact (common), blood (no), vertical (common), incubation period (short), persistent (common), annual incidence (high), seasonality (absent)
Principal component 3	12.7	envelope (absent), respiratory (no), fecal-oral (common), asymptomatic infection (high)
Principal component 4	9.0	GLOBAL, genome (RNA), envelope (present), contact (no), reinfection (common)