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Table 1 Recruitment strategies for Study 1 mail-out pilot and Study 2 of three enhanced mail-out strategies

From: Maximising follow-up participation rates in a large scale 45 and Up Study in Australia

Study and intervention arm of study Date mailed out Cost per unit received ($AU) Responses 30 days after questionnaire mail-out Overall RR (%) and 95 % CI Gender AGE  
Males Females Aged 45–64 years Aged 65+ years  
Responded RR Responded RR Responded RR Responded RR
Study 1 pilot
5000 Questionnaire Questionnaire (Q) sent 24 March 2010 $4.19 2084 41.7 %*
[40.3–43.5]
961 41.2 %
[39.2–43.2]
1123 42.1 %
[40.2–43.9]
1233 42.6 %
[40.8–44.4]
851 40.4 %
[38.3–42.5]
Study 2 enhanced mail-out
Strategy A
1000 Postcard + Questionnaire
Postcard 30 June 2010 + Q 7 July 2010 $3.13 505 50.5 %**
[47.4–53.5]
229 48.8 %
[44.3–53.3]
276 52.0 %
[47.7–56.2]
315 52.2
[48.2–56.2]
190 48.0 %
[43.1–52.9]
Strategy B
1000 Questionnaire + Reminder
Q 7 July 2010 + Reminder 21 July 2010 $3.20 541 54.1 %
[51.0–57.2]
278 52.4 %
[48.1–56.6]
263 56.1 %
[51.6–60.5]
330 55.6 %
[51.6–59.6]
211 51.8 %
[47.0–56.7]
Strategy C
1000 Postcard + Questionnaire + Reminder
Postcard 30 June 2010 + Q 7 July 2010 + Reminder 21 July 2010 $3.78 564 56.4 %
[53.3–59.4]
242 60.0 %
[55.2–64.7]
322 53.9 %
[49.9–57.9]
350 57.7 %
[53.7–61.5]
214 54.5 %
[49.5–59.3]
  1. Q questionnaire mailed out; RR response rate (computed as at 30 days from sending the invitation/questionnaire pack)
  2. * Study 1 different to all arms of Study 2, p < 0.05; ** Unadjusted (Strategy A) versus (Strategy C) p = 0.004; (Strategy A) versus (Strategy B) p=0.053