Background Telephone services can provide information and support for smokers. Counselling may be provided proactively or o ered reactively to callers to smoking cessation helplines. Objectives To evaluate the e ect of telephone support to help smokers quit, including proactive or reactive counselling, or the provision of other information to smokers calling a helpline. Search methods We searched the Cochrane Tobacco Addiction Group Specialised Register, clinicaltrials.gov, and the ICTRP for studies of telephone counselling, using search terms including 'hotlines' or 'quitline' or 'helpline'. Date of the most recent search: May 2018. Selection criteria Randomised or quasi-randomised controlled trials which o ered proactive or reactive telephone counselling to smokers to assist smoking cessation. Data collection and analysis We used standard methodological procedures expected by Cochrane. We pooled studies using a random-e ects model and assessed statistical heterogeneity amongst subgroups of clinically comparable studies using the I 2 statistic. In trials including smokers who did not call a quitline, we used meta-regression to investigate moderation of the e ect of telephone counselling by the planned number of calls in the intervention, trial selection of participants that were motivated to quit, and the baseline support provided together with telephone counselling (either self-help only, brief face-to-face intervention, pharmacotherapy, or financial incentives). Main results We identified 104 trials including 111,653 participants that met the inclusion criteria. Participants were mostly adult smokers from the general population, but some studies included teenagers, pregnant women, and people with long-term or mental health conditions. Most trials (58.7%) were at high risk of bias, while 30.8% were at unclear risk, and only 11.5% were at low risk of bias for all domains assessed. Most studies (100/104) assessed proactive telephone counselling, as opposed to reactive forms. Among trials including smokers who contacted helplines (32,484 participants), quit rates were higher for smokers receiving multiple sessions of proactive counselling (risk ratio (RR) 1.38, 95% confidence interval (CI) 1.19 to 1.61; 14 trials, 32,484 participants; I 2 = 72%) Telephone counselling for smoking cessation (Review)
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