What question did this study set out to answer?

To determine the impact of questionnaire length on response rates and quality of responses in older women.

Does Length of Questionnaire Matter? A Randomised Trial of Response Rates to a Mailed Questionnaire

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Randomized trial shows longer questionnaires reduce response rates in older women, suggesting need for brevity.

To determine the impact of questionnaire length on response rates and quality of responses in older women.
Randomized trial design comparing 5-page and 7-page questionnaires
Target population: women aged 70 years and over
Assessment of response rates and response quality
Response rates decreased significantly for the 7-page questionnaire compared to the 5-page version.
Length does not impact the quality of responses to initial questions.

Iglesias et al. (2000) studied this question.

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