Table 2.

Definition of quitters and continued smokers in the studies included in the systematic review and meta-analysis on the prognostic effect of quitting smoking at or around diagnosis on the survival of bladder cancer patients.

Author, Year	Quitters	Continued Smokers
Serretta, 2021 [24]	Definitively stopped smoking at diagnosis.	Continued to smoke after diagnosis or restarted smoking after a period of cessation.
van Osch, 2018 [25]	Quit smoking post-diagnosis and abstained consistently.	Continued smoking post-diagnosis.
Koshiaris, 2017 [26] (a)	Had stopped smoking the last time, the smoking status was assessed during the first year of follow-up.	Continued smoking the last time the smoking status was assessed during the first year of follow-up.
Grotenhuis, 2015 [27]	Quit smoking in the first year after diagnosis.	Did not quit smoking within 1 year after diagnosis
Tao, 2013 [28]	Never smoked cigarettes after diagnosis.	Continued to smoke until death or the latest follow-up interview.
Lee, 2012 [29]	Quit smoking between 1 year and 1 month prior to diagnosis.	Smoked between 1 year and 1 month prior to diagnosis.
Sfakianos, 2010 [30]	Stopped smoking at the time of the start of treatment.	Continued smoking after diagnosis.
Chen, 2007 [31]	Stopped smoking within a year before and 3 months after diagnosis.	Never stopped smoking even at 3 months after diagnosis.
Fleshner, 1999 [32]	Quit smoking between 1 year prior to and up to 3 months following the diagnosis.	Continued smoking after diagnosis.

^(a) For 527 patients (30% of the total), the smoking status during the first year of follow-up (continued/quitter) was unknown and was imputed via multiple imputations.