Table 2.
Overview of feasibility and effectiveness of recruitment by message frame
| Feasibility | Effectiveness | |||||||
|---|---|---|---|---|---|---|---|---|
| Message type | Messages sent | Cancelleda | % Cancelled (95% CI)b | Interested | % Interested (95% CI)c | Enrolled | % Enrolled (95% CI)d | % of smokers enrolled (estimate)e |
| Free | 2580 | 60 | 2.33% (1.78–2.98%) | 232 | 8.99% (7.92–10.16%) | 46 | 1.78% (1.31–2.37%) | 17.48% |
| Empathy | 4871 | 39 | 1.31% (0.94–1.79%) | 505 | 10.37% (9.53–11.26%) | 97 | 1.99% (1.62–2.42%) | 19.52% |
| Pride | 2743 | 33 | 1.78% (1.23–2.49%) | 301 | 10.97%f (9.83–12.20%) | 56 | 2.04% (1.55–2.64%) | 20.02% |
| Total | 10,194 | 132 | 1.78% (1.49–2.11%) | 1038 | 10.18% (9.60–10.79%) | 199 | 1.95% (1.69–2.24%) | 19.14% |
aDays when Text4baby subscribers were sent another ad hoc or topical module message were excluded. The total excludes November 3, 2015; December 8, 2015; and January 26, 2016
bThe number of “STOP” text responses among the number of recruitment messages sent on the days Text4baby subscribers received the recruitment message only (free messages sent = 2580, empathy messages sent = 2968, and pride messages sent = 1855; total n = 7403)
cThe number of “YES” text responses among the number of recruitment messages sent
dThe number enrolled in the trial among the number of recruitment messages sent
eThe number enrolled in the trial among an estimated 10.2% of smokers who were sent a recruitment message
fFisher’s exact test two-tailed p value is <0.05 where empathy and pride messages were compared to the free message