“…Out of those 27 studies, 26 studies confirmed that younger patients are at higher risk of CINV than older patients (p < 0.05). However, the age threshold varied from 40 to 67 in 21 studies (Pollera and Giannarelli, 1989;Hursti et al, 1996;Booth et al, 2007;Dranitsaris et al, 2009;Petrella et al, 2009;Hesketh et al, 2010;Roscoe et al, 2010;Warr et al, 2011;Bourdeanu et al, 2012;Celio et al, 2012;Hilarius et al, 2012;Sekine et al, 2013;Jordan et al, 2014;Murakami et al, 2014;Iihara et al, 2016;Rha et al, 2016;Dranitsaris et al, 2017;Uchida et al, 2017;Kawazoe et al, 2018;Nawa-Nishigaki et al, 2018;Tsuji et al, 2019) and six studies (Molassiotis et al, 2013;Tamura et al, 2015;Di Mattei et al, 2016; Mizuno et al, 2016;Molassiotis et al, 2016;Shimokawa et al, 2019) considered age as a continuous variable in which five studies reported required results for computing the summary odds ratio. The thresholds were as follows: age < 40 (n = 4), age ≤ 50 (n = 3), age ≤ 55 (n = 7), age < 60 (n = 4), age < 65 (n = 2), and age < 67 (n = 1) (see Table 2).…”