Awareness of risk factors for cancer: a comparative study of Sweden and Denmark

BMC Public Health

Table 1 Data collection process and survey response

	Denmark	Sweden
Initial study base	60,000	23,000
Persons with research protection	6570	NA
Persons with no obtainable phone number	6309	3958
Further exclusions^a	55	NA
Eligible for being contacted	47,066	19,042
Total number of persons approached	11,297	12,750
Technical annulment	1664	1113
Number of ineligible persons	33	102
Number of persons eligible	9600	11,535
Number of persons who could not be contacted after seven attempts	1554	3414
Number of persons eligible and made contact to	8046	8121
Refused or did not complete the interview	5046	5051
Completed interviews	3000	3070

NA Not applicable
^aBefore start of data collection in Denmark, it was checked with CRS whether the persons 1) had a newly established research protection status (n = 7), 2) had emigrated from Denmark (n = 11) or 3) had passed away (n = 37)

ISSN: 1471-2458