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Table 1 Distribution of men randomized to each of the six modes of allocation

From: Effects of pre-notification, invitation length, questionnaire length and reminder on participation rate: a quasi-randomised controlled trial

Study Arm Pre-notification Invitation Questionnaire Reminder N
1. Yes Short Short Yes 3575
2. Yes Long Short Yes 3601
3. Yes Short Short No 6130
4. Yes Short Long No 4835
5. No Short Long No 4956
6. No Short Short No 5037
Total 28,134