7 Methods of statistical analysis Data will be entered into SPSS for Windows (version 20). Descriptive statistics such as frequency, percentage, and mean will be used to summarize the outcomes and other variables. Chi-square tests and t-tests will be used to compare outcome variables between subgroups. Fisher's exact test will be used to compare the quit rates between group A and group B. The intention-to-treat (ITT) analysis will be used such that those lost to contact and refused cases at the follow-ups will be treated as failure to achieve any cessation outcome.