Basal | 3 months | 6 months | 9 months | 12 months | |
---|---|---|---|---|---|
Group allocation and intervention | |||||
, Control group: | |||||
Brief advice on smoking cessation | x | x | x | x | x |
, Intervention group: | |||||
Brief advice on smoking cessation + CO-oximetry | x | x | x | x | x |
Outcome assessment | |||||
Pattern of tobacco use (self-reported tobacco use) | x | x | x | x | x |
Smoking cessation rates | x | x | x | x | |
Carbon monoxide (CO) levels in exhaled air by CO-oximetry in the intervention group | x | x | x | x | x |
Carbon monoxide (CO) levels in exhaled air by CO-oximetry in the control group | x | ||||
Urinary cotinine tests | x | x | x | x | x |
Nicotine dependence (Fagerström test scores) | x | x | x | x | x |
Motivational stages of change (Prochaska and DiClemente’s stages) | x | x | x | x | x |
Motivation for giving up smoking (Richmond test scores) | x | x | x | x | x |