01978nas a2200229   4500000000100000008004100001260001700042100001300059700001200072700001800084700001400102700001400116700001300130700001700143700001600160245009100176300000600267490000700273050001700280520142700297020002401724       2016                            d  c1697093135831 aBanks E.1 aJorm L.1 aPhongsavan P.1 aBauman A.1 aRogers K.1 aCowle A.1 aJalaludin B.1 aGrunseit A.00aMaximising follow-up participation rates in a large scale 45 and Up Study in Australia  a60 v13  a[IF]: 2.17003 a<p>
BACKGROUND: The issue of poor response rates to population surveys has existed for some decades, but few studies have explored methods to improve the response rate in follow-up population cohort studies. METHODS: A sample of 100,000 adults from the 45 and Up Study, a large population cohort in Australia, were followed up 3.5 years after the baseline cohort was assembled. A pilot mail-out of 5000 surveys produced a response rate of only 41.7 %. This study tested methods of enhancing response rate, with three groups of 1000 each allocated to (1) receiving an advance notice postcard followed by a questionnaire, (2) receiving a questionnaire and then follow-up reminder letter, and (3) both these strategies. RESULTS: The enhanced strategies all produced an improved response rate compared to the pilot, with a resulting mean response rate of 53.7 %. Highest response was found when both the postcard and questionnaire reminder were used (56.4 %) but this was only significantly higher when compared to postcard alone (50.5 %) but not reminder alone (54.1 %). The combined approach was used for recruitment among the remaining 92,000 participants, with a resultant further increased response rate of 61.6 %. CONCLUSIONS: Survey prompting with a postcard and a reminder follow-up questionnaire, applied separately or combined can enhance follow-up rates in large scale survey-based epidemiological studies.
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