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. 2017 Aug 22;117(8):1121–1127. doi: 10.1038/bjc.2017.284

Table 3. Possible unintended consequences, mechanisms of action and acceptability of the incentive.

  Intervention arm n/N (%, 95% CI) Standard invitation arm n/N (%, 95% CI)
Possible unintended consequences
Parents made an informed decision 28/54 (51.9, 26.7–76.1) 9/33 (27.3, 7.6–63.2)
Acceptability
Incentives are a good idea 42/59 (71.2, 47.7–87.0) 25/35 (71.4, 45.0–88.4)
Possible mechanisms of action
Very/quite motivated to return the form 105/200 (52.5, 35.0–69.4) 101/191 (52.9, 45.7–59.9)
Very easy/easy to remember to return the form 154/201 (76.6, 43.5–93.3) 133/193 (68.9, 63.6–73.8)
Returning the form is very/quite important 125/203 (61.6, 39.7–79.6) 131/194 (67.5, 59.1–74.9)
Gave consent form to parents the same day they received it from school 141/202 (69.8, 47.6–85.5) 111/193 (57.5, 52.3–62.5)