The effect of an informational newsletter on control participation rates: a randomized study.
We employed a randomized study of 344 subjects to determine whether an initial contact letter accompanied by an informational newsletter increased participation in a population-based case-control study. The results indicated that there was no benefit in including a newsletter with a letter of introduction. There may have been a slight detrimental effect, since those who received the newsletter were less likely to consent to an in-person interview (82%) than those who did not (88%).
Heuser
L
L
Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA.
Davis
S
S
D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010506:Periodicals as Topic; D011897:Random Allocation; D012107:Research Design