Table 1. Grouping of respondents for statistical purposes.

Attribute	Groups
Age range	< 24 years; 24 years or older.
Family income	< Five times the minimum wage; five times the minimum wage or more.
Sexual initiation	Before 16 years of age; later or none.
Sexual partners	None; one; two or more (per year).
Vaccination status	Vaccinated; not vaccinated but willing to be vaccinated; not vaccinated and no desire to be vaccinated.
Sources of advice about the vaccine	None; personal (parent, friend, doctor, or health professional); media (internet, printed material, television or government campaigns).