Table 3.

Effects of supplementary prompt on voter turnout

Statistics (by type of canvassing)	Control group	Treatment group
No supplementary prompt
Percentage voting, %	44.5	46.2
Number of persons	7,949	1,563
Contact rate, %	—	36.9
With supplementary  prompt
Percentage voting, %	44.7	47.3
Number of persons	15,972	2,946
Contact rate, %	—	34.9
Estimated effect of personal contact by voter turnout
With supplementary prompt
Turnout differential (2.6%)/contact rate (34.9%) = 7.45% (±2.85% SEM)
No supplementary prompt
Turnout differential (1.7%)/contact rate (36.9%) = 4.61% (±3.73% SEM)