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• W1566155680 abstract "Background Postal and electronic questionnaires are widely used for data collection in epidemiological studies but non‐response reduces the effective sample size and can introduce bias. Finding ways to increase response to postal and electronic questionnaires would improve the quality of health research. Objectives To identify effective strategies to increase response to postal and electronic questionnaires. Search methods We searched 14 electronic databases to February 2008 and manually searched the reference lists of relevant trials and reviews, and all issues of two journals. We contacted the authors of all trials or reviews to ask about unpublished trials. Where necessary, we also contacted authors to confirm methods of allocation used and to clarify results presented. We assessed the eligibility of each trial using pre‐defined criteria. Selection criteria Randomised controlled trials of methods to increase response to postal or electronic questionnaires. Data collection and analysis We extracted data on the trial participants, the intervention, the number randomised to intervention and comparison groups and allocation concealment. For each strategy, we estimated pooled odds ratios (OR) and 95% confidence intervals (CI) in a random‐effects model. We assessed evidence for selection bias using Egger's weighted regression method and Begg's rank correlation test and funnel plot. We assessed heterogeneity among trial odds ratios using a Chi2 test and the degree of inconsistency between trial results was quantified using the I2 statistic. Main results Postal We found 481 eligible trials. The trials evaluated 110 different ways of increasing response to postal questionnaires. We found substantial heterogeneity among trial results in half of the strategies. The odds of response were at least doubled using monetary incentives (odds ratio 1.87; 95% CI 1.73 to 2.04; heterogeneity P < 0.00001, I2 = 84%), recorded delivery (1.76; 95% CI 1.43 to 2.18; P = 0.0001, I2 = 71%), a teaser on the envelope ‐ e.g. a comment suggesting to participants that they may benefit if they open it (3.08; 95% CI 1.27 to 7.44) and a more interesting questionnaire topic (2.00; 95% CI 1.32 to 3.04; P = 0.06, I2 = 80%). The odds of response were substantially higher with pre‐notification (1.45; 95% CI 1.29 to 1.63; P < 0.00001, I2 = 89%), follow‐up contact (1.35; 95% CI 1.18 to 1.55; P < 0.00001, I2 = 76%), unconditional incentives (1.61; 1.36 to 1.89; P < 0.00001, I2 = 88%), shorter questionnaires (1.64; 95% CI 1.43 to 1.87; P < 0.00001, I2 = 91%), providing a second copy of the questionnaire at follow up (1.46; 95% CI 1.13 to 1.90; P < 0.00001, I2 = 82%), mentioning an obligation to respond (1.61; 95% CI 1.16 to 2.22; P = 0.98, I2 = 0%) and university sponsorship (1.32; 95% CI 1.13 to 1.54; P < 0.00001, I2 = 83%). The odds of response were also increased with non‐monetary incentives (1.15; 95% CI 1.08 to 1.22; P < 0.00001, I2 = 79%), personalised questionnaires (1.14; 95% CI 1.07 to 1.22; P < 0.00001, I2 = 63%), use of hand‐written addresses (1.25; 95% CI 1.08 to 1.45; P = 0.32, I2 = 14%), use of stamped return envelopes as opposed to franked return envelopes (1.24; 95% CI 1.14 to 1.35; P < 0.00001, I2 = 69%), an assurance of confidentiality (1.33; 95% CI 1.24 to 1.42) and first class outward mailing (1.11; 95% CI 1.02 to 1.21; P = 0.78, I2 = 0%). The odds of response were reduced when the questionnaire included questions of a sensitive nature (0.94; 95% CI 0.88 to 1.00; P = 0.51, I2 = 0%). Electronic We found 32 eligible trials. The trials evaluated 27 different ways of increasing response to electronic questionnaires. We found substantial heterogeneity among trial results in half of the strategies. The odds of response were increased by more than a half using non‐monetary incentives (1.72; 95% CI 1.09 to 2.72; heterogeneity P < 0.00001, I2 = 95%), shorter e‐questionnaires (1.73; 1.40 to 2.13; P = 0.08, I2 = 68%), including a statement that others had responded (1.52; 95% CI 1.36 to 1.70), and a more interesting topic (1.85; 95% CI 1.52 to 2.26). The odds of response increased by a third using a lottery with immediate notification of results (1.37; 95% CI 1.13 to 1.65), an offer of survey results (1.36; 95% CI 1.15 to 1.61), and using a white background (1.31; 95% CI 1.10 to 1.56). The odds of response were also increased with personalised e‐questionnaires (1.24; 95% CI 1.17 to 1.32; P = 0.07, I2 = 41%), using a simple header (1.23; 95% CI 1.03 to 1.48), using textual representation of response categories (1.19; 95% CI 1.05 to 1.36), and giving a deadline (1.18; 95% CI 1.03 to 1.34). The odds of response tripled when a picture was included in an e‐mail (3.05; 95% CI 1.84 to 5.06; P = 0.27, I2 = 19%). The odds of response were reduced when Survey was mentioned in the e‐mail subject line (0.81; 95% CI 0.67 to 0.97; P = 0.33, I2 = 0%), and when the e‐mail included a male signature (0.55; 95% CI 0.38 to 0.80; P = 0.96, I2 = 0%). Authors' conclusions Health researchers using postal and electronic questionnaires can increase response using the strategies shown to be effective in this systematic review." @default.
• W1566155680 created "2016-06-24" @default.
• W1566155680 creator A5015938793 @default.
• W1566155680 creator A5020758417 @default.
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• W1566155680 date "2009-07-08" @default.
• W1566155680 modified "2023-10-16" @default.
• W1566155680 title "Methods to increase response to postal and electronic questionnaires" @default.
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