General public surveys were all conducted between December 2006 and January 2007, using random digit dialing
in each country to reach representative samples of adult population aged 15 and older.
We acknowledge that a "bank" of these readily accessible controls could permit more rapid recruitment of participants in numerous age strata and obviate the need for extensive random digit dialing
to recruit an adequate age-matched control population in many investigations.
GfK Roper Public Affairs & Media conducted this study using Random Digit Dialing
(RDD) methodology from December 15, 2006 to December 17, 2006.
The Cromer Group's statewide survey used random digit dialing
to interview 607 registered voters in six key regions of the state - Southeast, Kenai Peninsula, Mat-Su Valley, Fairbanks and rural Alaska.
Using a random digit dialing
methodology, Greenwald & Associates polled 1,603 people born between 1946 and 1978, with household incomes of $35,000 or more.
A Computer Assisted Telephone Interviewing (CATI) facility and Random Digit Dialing
(RDD) technology were used.