question: Compared to Practitioner-delivered brief advice what was the result of Tailored letters on 7-day point prevalence abstinence?
context: the tailored letters intervention was significantly more effective than brief advice for 24-hour [odds ratio (OR) = 1.4; P = 0.047] but not for 7-day point prevalence abstinence (OR = 1.4; P = 0.068) for prolonged abstinence, or for alternative assumptions about participants lost to follow-up.