Following Green & Gerber,this section is not rated by level of confidence. These statements are unrated impressions from a growing body of research.
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18-year-olds and recent moves

** Mailing registration forms with instructions to those turning 18, or to people who have recently moved, increases registration.  The effect is about 1 new registrant per 66 mailings.  (Green & Gerber, 2023) (Loewenstein, J.)