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Table 1 Response rates and odds ratios (OR) with 95% confidence intervals for participation according to incentive and manner of writing name and address on envelope, 6 month olds (n = 398)

From: Means of increasing response rates in a Norwegian dietary survey among infants – results from a pseudo-randomized pilot study

 

Participated/invited (response rate)

OR (95% CI)

pa

Incentive

 

1.6 (1.1, 2.4)

0.028

 Gift certificateb

144/200 (72%)

  

 Lotteryc

122/198 (62%)

  

Personalization

 

1.1 (0.7, 1.6)

0.72

 Handwritten name and addressd

134/198 (68%)

  

 Printed name and addresse

132/200 (66%)

  
  1. aDifferences in response rates between the groups were tested with logistic regression
  2. bAll participants received a gift certificate worth 500 NOK (50 EUR)
  3. eParticipants took part in a lottery of two prizes; 5000 NOK (500 EUR) and 10,000 NOK (1000 EUR)
  4. dInvited sample received invitation envelope with a handwritten name and address
  5. eInvited sample received invitation envelope with name and address on a printed label
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BMC Medical Research Methodology

ISSN: 1471-2288

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