Table 2. Participation, response rates and break-off rates.
| Mode | Invitations | Started Interview | Completed Interview | ResponseRate a | Break-off Rate b | Completed Online Debriefing |
|---|---|---|---|---|---|---|
| Human Voice | 316 | 169 | 164 | 51.90% | 2.96% | 160 |
| Automated Voice | 414 | 187 | 162 | 39.13% | 13.37% | 159 |
| Human Text | 227 | 176 | 163 | 71.81% | 7.39% | 158 |
| Automated Text | 325 | 185 | 159 | 48.92% | 14.05% | 157 |
| Total | 1282 | 717 | 648 | 50.55% | 9.62% | 634 |
aThe response rate (known as AAPOR RR1 [29]) is calculated as the number of complete interviews divided by the number of invitations.
bThe break-off rate is calculated as the number of people who dropped off during the survey divided by the number of people who started.