Table 1 Basic characteristics of selected articles
Study | Study design | Duration | Country | Total no. of patients (n) | Male (%) | Mean age (years) | Factors present | Risk of bias |
|---|---|---|---|---|---|---|---|---|
Juratli et al. [11] | Cohort | 1993–2007 | Germany | 71 | N/A* | 43.5 | Age | Low risk |
Bianco et al. [12] | Cohort | 1999–2008 | Brazil | 82 | 57 | 41.3 | KPS | Low risk |
Babu et al. [13] | Cohort | N/A* | USA | 500 | 55.4 | 40.1 | Age, size, and resection | Low risk |
Jakola et al. [14] | Cohort | 1998–2009 | Norway | 117 | 58 | 44 | Age, KPS, and size | Low risk |
Choi et al. [15] | Cohort | 2003–2015 | South Korea | 153 | 56 | 45.6 | Size | Low risk |