From the Health Information National Trends Survey:
When you use the Internet at home, do you mainly access it through a telephone modem, a cable or satellite modem, a DSL modem, a wireless device such as a PDA, or some other way?
[NUMERATOR AND DENOMINATOR:]
Do you ever go on-line to access the Internet or World Wide Web, or to send and receive e-mail?
HINTS is a biennial, cross-sectional survey of a nationally-representative sample of American adults that is used to assess the impact of the health information environment.