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. 1999 Sep 14;96(19):10939–10942. doi: 10.1073/pnas.96.19.10939

Table 1.

The effect of personal canvassing on voter turnout in New Haven

Statistics Relationship between experimental subgroups and voter turnout
Control group (no personal contact) Treatment group Treatment group (actual contact)
Percentage voting, % 44.63 46.88 59.19
Number of persons 23,921 4,509 1,605
Contact rate, % 35.60
Estimated effect of personal contact on voter turnout
 Turnout differential (2.25%)/contact rate (35.60%) = 6.33% (±2.27% SEM)