Some public survey data I found showed that 8% of British homes had a mobile
but no fixed line; and suggested that lone parents were most likely to have
given up their fixed line phones in place of mobiles.
The main problem in the UK for using fixed line phones for sampling is that about half of
households are now "ex-directory": see
http://news.bbc.co.uk/1/hi/magazine/5168570.stm <http://news.bbc.co.uk/1/hi/magazine/5168570.stm>
Lynne Hamill
Dept of Sociology, University of Surrey, Guildford, UK
________________________________
From: [email protected] on behalf of [EMAIL PROTECTED]
Sent: Fri 19/01/2007 09:01
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Telephone Coverage and Health Survey Estimates
Hello all,
Here is an article from the Center for Disease Control (of all places). They are interested to know if the shift form landline to wireless telephony biases their surveys. They do what seems to be a good job of reporting on the adoption rates for mobile telephony.
The results and conclusions are as follows:
Results. When interviewed, 7.2% of adults, including those who did and did not
have wireless telephones, did not have landline telephones. Relative to adults
with landline telephones, adults without landline telephones had greater odds
of smoking and being uninsured, and they had lower odds of having diabetes,
having a usual place for medical care, and having received an influenza
vaccination in the past year.
Conclusions. As people substitute wireless telephones for landline telephones,
the percentage of adults without landline telephones has increased
significantly but is still low, which minimizes the bias resulting from their
exclusion from telephone surveys. Bias greater than 1 percentage point is
expected only for estimates of health insurance, smoking, binge drinking,
having a usual place for care, and receiving an influenza vaccination.
http://www.ajph.org/cgi/reprint/96/5/926 <http://www.ajph.org/cgi/reprint/96/5/926>
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