Table 2 Characteristics of the included studies
Study, year | Country | Study types | Age (RT vs non-RT, years) | Gender (LS vs RT, male %) | RT participants | Non-RT participants | Disease stage | Median follow-up (RT vs non-RT, month) |
|---|---|---|---|---|---|---|---|---|
Fassnacht, 2006 [9] | Germany | Retrospective | 43 vs 48 | N/A | 14 | 14 | I, II, III and IV | 37 |
Habra, 2013 [10] | America | Retrospective | 48 vs 44 | 37.5 vs 34.4 | 16 | 32 | II and III | 22.1 vs 32.2 |
Sabolch, 2015 [11] | America | Retrospective | 49.5 vs 42.3 | 50 vs 25 | 20 | 20 | II and III | 34 |
Srougi, 2017 [12] | Brazil | Retrospective | 40 vs 38 | 40 vs 10 | 10 | 10 | N/A | 32 vs 35 |
Gharzai, 2019 [13] | America | Retrospective | 44.9 vs 47.1 | 46.2 vs 46.2 | 39 | 39 | I, II, III and IV | 50.5 |
Zhu, 2020 | China | Retrospective | 43.4 vs 42.9 | 41.7 vs 47.1 | 12 | 12 | I, II, III and IV | 23 vs 37 |