Cost-utility of cytisine for smoking cessation over and above behavioural support in people with newly diagnosed pulmonary tuberculosis: an economic evaluation of a multicentre randomised controlled trial

Jinshuo Li*, Steve Parrott, Ada Keding, Omara Dogar, Rhian Gabe, Anna-Marie Marshall, Rumana Huque, Deepa Barua, Razia Fatima, Amina Khan, Raana Zahid, Sonia Mansoor, Daniel Kotz, Melanie Boeckmann, Helen Elsey, Eva Kralikova, Anne Readshaw, Aziz Sheikh, Kamran Siddiqi, TB & Tobacco Consortium

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

OBJECTIVES: To assess the cost-effectiveness of cytisine over and above brief behavioural support (BS) for smoking cessation among patients who are newly diagnosed with pulmonary tuberculosis (TB) in low-income and middle-income countries.

DESIGN: An incremental cost-utility analysis was undertaken alongside a 12-month, double-blind, two-arm, individually randomised controlled trial from a public/voluntary healthcare sector perspective with the primary endpoint at 6 months post randomisation.

SETTING: Seventeen subdistrict hospitals in Bangladesh and 15 secondary care hospitals in Pakistan.

PARTICIPANTS: Adults (aged ≥18 years in Bangladesh and ≥15 years in Pakistan) with pulmonary TB diagnosed within the last 4 weeks who smoked tobacco daily (n=2472).

INTERVENTIONS: Two brief BS sessions with a trained TB health worker were offered to all participants. Participants in the intervention arm (n=1239) were given cytisine (25-day course) while those in the control arm (n=1233) were given placebo. No significant difference was found between arms in 6-month abstinence.

PRIMARY AND SECONDARY OUTCOME MEASURES: Costs of cytisine and BS sessions were estimated based on research team records. TB treatment costs were estimated based on TB registry records. Additional smoking cessation and healthcare costs and EQ-5D-5L data were collected at baseline, 6-month and 12-month follow-ups. Costs were presented in purchasing power parity (PPP) adjusted US dollars (US$). Quality-adjusted life years (QALYs) were derived from the EQ-5D-5L. Incremental total costs and incremental QALYs were estimated using regressions adjusting for respective baseline values and other baseline covariates. Uncertainty was assessed using bootstrapping.

RESULTS: Mean total costs were PPP US$57.74 (95% CI 49.40 to 83.36) higher in the cytisine arm than in the placebo arm while the mean QALYs were -0.001 (95% CI -0.004 to 0.002) lower over 6 months. The cytisine arm was dominated by the placebo arm.

CONCLUSIONS: Cytisine plus BS for smoking cessation among patients with TB was not cost-effective compared with placebo plus BS.

TRIAL REGISTRATION NUMBER: ISRCTN43811467.

Original languageEnglish
Article numbere049644
Number of pages9
JournalBMJ Open
Volume12
Issue number8
DOIs
Publication statusPublished - 26 Aug 2022

Keywords

  • Adolescent
  • Adult
  • Alkaloids
  • Azocines
  • Cost-Benefit Analysis
  • Humans
  • Quinolizines
  • Smoking Cessation
  • Tuberculosis, Pulmonary

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