Estimates of abstinence at 6 and 12 months, N=1785
| Intervention group | 6-Month survey outcomes | 12-Month survey outcomes | ||||||
|---|---|---|---|---|---|---|---|---|
| N | Did not smoke in last 7 days | N | Did not smoke in the last 30 days | N | Did not smoke in last 7 days | N | Did not smoke in the last 30 days | |
| Responders* | ||||||||
| Standard | 368 | 66.0 (61.2 to 70.9) | 368 | 60.6 (55.6 to 65.6) | 363 | 65.3 (60.4 to 70.2) | 362 | 61.6 (56.6 to 66.6) |
| Standard plus TEQ-10 | 368 | 69.6 (64.9 to 74.3) | 368 | 65.2 (60.4 to 70.1) | 370 | 67.0 (62.2 to 71.8) | 371 | 63.1 (58.2 to 68.0) |
| Difference compared to standard | 3.5 (−3.2 to 10.3) p=0.3051 | 4.6 (−2.4 to 11.6) p=0.1946 | 1.7 (−5.1 to 8.6) p=0.6191 | 1.5 (−5.5 to 8.5) p=0.6812 | ||||
| Standard plus TEQ-20 | 352 | 67.3 (62.4 to 72.2) | 352 | 61.1 (56.0 to 66.2) | 310 | 62.6 (57.2 to 68.0) | 311 | 56.6 (51.1 to 62.1) |
| Difference compared to standard | 1.3 (−5.6 to 8.2) p=0.7121 | 0.5 (−6.6 to 7.6) p=0.8947 | −2.7 (−10.0 to 4.6) p=0.4655 | −5.0 (−12.5 to 2.4) p=0.1871 | ||||
| Intent-to-treat penalised imputation (missing=smoking)† | ||||||||
| Standard | 592 | 41.1 (37.1 to 45.0) | 592 | 37.6 (33.8 to 41.6) | 592 | 40.0 (36.1 to 44.0) | 592 | 37.7 (33.8 to 41.6) |
| Standard plus TEQ-10 | 602 | 42.5 (38.6 to 46.5) | 602 | 39.9 (36.0 to 43.8) | 602 | 41.2 (37.3 to 45.1) | 602 | 38.9 (35.0 to 42.8) |
| Difference compared to standard | 1.5 (−4.1 to 7.1) p=0.6047 | 2.2 (−3.3 to 7.7) p=0.4357 | 1.2 (−4.4 to 6.7) p=0.6827 | 1.2 (−4.3 to 6.7) p=0.6693 | ||||
| Standard plus TEQ-20 | 591 | 40.1 (36.2 to 44.1) | 591 | 36.4 (32.5 to 40.3) | 591 | 32.8 (29.0 to 36.6) | 591 | 29.8 (26.1 to 33.5) |
| Difference compared to standard | −1.0 (−6.5 to 4.7) p=0.7405 | −1.3 (−6.8 to 4.2) p=0.6459 | −7.2 (−12.7 to −1.7) p=0.0100 | −7.9 (−13.3 to −2.5) p=0.0041 | ||||
| Multiple imputation‡ | ||||||||
| Standard | 592 | 64.2 (59.5 to 68.9) | 592 | 59.4 (53.7 to 63.8) | 592 | 63.3 (58.4 to 68.4) | 592 | 61.2 (55.6 to 66.8) |
| Standard plus TEQ-10 | 602 | 67.8 (63.0 to 72.7) | 602 | 62.3 (57.7 to 66.9) | 602 | 65.1 (60.3 to 69.9) | 602 | 60.6 (56.0 to 65.2) |
| Difference compared to standard | 3.6 (−3.3 to 10.5) p=0.2980 | 3.6 (−3.2 to 10.4) p=0.2969 | 1.7 (−4.4 to 7.7) p=0.5831 | −0.6 (−7.6 to 6.4) p=0.8647 | ||||
| Standard plus TEQ-20 | 591 | 64.7 (59.2 to 70.2) | 591 | 59.4 (53.7 to 65.1) | 591 | 60.9 (56.4 to 65.5) | 591 | 54.9 (49.0 to 60.9) |
| Difference compared to standard | 0.5 (−7.0 to 8.0) p=0.8982 | 0.7 (−6.4 to 7.8) p=0.8468 | −2.5 (−9.4 to 4.5) p=0.4808 | −6.3 (−14.9 to 2.3) p=0.1471 | ||||
Percentage of participants reporting abstinence is shown in table above with 95% CIs in parentheses. p Values obtained from χ2 test for difference between proportions.
*Estimates were obtained among participants having completed a 6-month or 12-month survey.
†Estimates were obtained assuming participants missing a 6-month or 12-month survey were not abstinent.
‡Estimates were obtained by pooling results across 10 multiply imputed data sets.
TEQ-10, Technology Enhanced Quitline-10.