Outpatient smoking cessation: preliminary findings of a non-inferiority RCT comparing blended with face-to-face delivery mode

Lutz Siemer, Marcel E. Pieterse, Somaya Ben Allouch, Marloes G. Postel, Robbert Sanderman, Marjolein Brusse-Keizer

Research output: Contribution to journalMeeting AbstractAcademic


Background: Blended face-to-face and web-based treatment is a promising mode to deliver smoking cessation treatment. In an outpatient clinic in a Dutch Hospital effectiveness of a blended treatment (BSCT) was compared to usual face-to-face treatment (F2F). The results from 6 months post-treatment follow-up are presented here.

Methods: In this open-label two-arm non-inferiority RCT patients (N=344) of a Dutch outpatient smoking cessation clinic were assigned either to the blended smoking cessation treatment (BSCT, N=167) or a face-to-face treatment with identical ingredients and duration (F2F, N=177). CO-validated point prevalence abstinence at 6 months follow-up, taken shortly after end of treatment was analyzed. Intention-to-treat analyses were performed, retaining missing participants as continuing smokers. Non-inferiority was assessed based on a one-sided margin of five percentage points difference between arms. Additionally, a Bayes Factor was estimated (with a BF>3 supporting non-inferiority, and a <.3 rejecting non-inferiority).

Method: At 6 months follow up, 23 BSCT participants (13.8%) and 31 F2F participants (17.5%) were abstinent, with a difference of 3.7% (95%CI: 11.4;-4.0) in favor of F2F. Furthermore, a BF=1.28 was found.

Discussion: Based on observed biochemically validated abstinence rates, this RCT suggests that delivering outpatient smoking cessation treatment in a blended mode yields comparable quit rates as full face-to-face treatment mode. However, non-inferiority could not be supported conclusively. Ignoring patient preferences for either of the delivery modes may explain these inconclusive findings.
Original languageEnglish
Article number4385
Number of pages1
JournalEuropean Respiratory Journal
Issue numberSuppl. 64
Publication statusPublished - 7 Sept 2020
EventERS (European Respiratory Society) International Congress 2020 - Vienna, Austria
Duration: 5 Sept 20209 Sept 2020


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