Online version of the self-administered food frequency questionnaire for the Japan Public Health Center-based Prospective Study for the Next Generation (JPHC-NEXT) protocol: Relative validity, usability, and comparison with a printed questionnaire
Background: Online dietary assessment tools offer advantages over printed questionnaires, such as the automatic and direct data storage of answers, and have the potential to become valuable research methods. We developed an online survey system (web-FFQ) for the existing printed FFQ used in the JPHC...
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| Format: | Article |
| Language: | English |
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Japan Epidemiological Association
2017-09-01
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| Series: | Journal of Epidemiology |
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| Online Access: | https://www.jstage.jst.go.jp/article/jea/27/9/27_JE96/_pdf |