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The odds ratio of response rate by the 4 different modes in the Danish 2011 NordChild questionnaire survey.
| Modea | Odds ratio (95% CI) |
| Paper | 1 (ref) |
| Paper/Web | 0.91 (0.74, 1.10) |
| Web | 0.89 (0.73, 1.09) |
| Web/tablet | 0.89 (0.73, 1.09) |
aPaper: paper version of questionnaire, paper/Web: paper and/or Web-based questionnaire, Web: Web-based questionnaire, Web/tablet: Web-based questionnaire with opportunity to win a tablet computer within the first 14 days after invitation.
