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Table 1 Variables of interest for subgroup analysis

From: Effectiveness of smoking cessation interventions among adults: an overview of systematic reviews

Category of analysis

Variables of interest

Populations

• Fewer versus more quit attempts

• Opportunistic versus individuals seeking treatment (or based on motivation to quit)

• Baseline level of nicotine dependence (e.g. using a validated scale or cigarettes per day as a proxy)

• By demographic factors (age, socio-economic status (SES), sex, ethnicity, (lesbian, gay, bisexual, transgender, queer and others (LGBTQ+))

• By comorbid conditions (e.g. mental illness, Human immunodeficiency virus infection, cardiovascular disease, chronic obstructive pulmonary disease (COPD), obesity, substance use disorder)

Intervention-related variables

• Dose, type, duration, number of sessions

• Specific forms of an intervention (e.g. yoga as a form of exercise)

• Behavioural change technique (e.g. providing information on consequences of smoking, explaining the importance of abrupt cessation, receiving prompt commitment from the patient)

Settings

• Family medicine clinics

• Walk-in clinics

• Smoking cessation clinics

• Urgent care facilities

• Emergency departments

• Public health units

• Pharmacies

• Dental offices

• Behavioural health/substance use treatment facilities (ambulatory or outpatient)

• Telehealth

• Academic research settings

Other variables

• By industry funding status