| | Study | Area | Design | Sample | Participant | Average | Gender ratio | Types of lung neoplasms |
| | Xu [14] | A | Cross-sectional study | 150 | A | 54.54 ± 11.35 | 2 : 1 | A | | Song [22] | A | Cross-sectional study | 68 | B | 45.46 ± 12.35 | 2 : 3 | NA | | Xia [12] | B | Cross-sectional study | 150 | A | 57.93 ± 15.48 | 2 : 1 | NA | | Zhang [26] | A | Cross-sectional study | 184 | A + B | 61.46 ± 12.00 | 3 : 1 | NA | | Zhou 2015 | A | Cross-sectional study | 220 | B | 56.66 ± 9.52 | 3 : 2 | B, C | | Chen [20] | C | Cross-sectional study | 89 | A + B | 67.98 ± 6.99 | 2 : 1 | C, D | | Lin [25] | A | Cross-sectional study | 170 | B | 63.56 ± 7.13 | 3 : 1 | C, D, E, F | | Cui [16] | C | Cross-sectional study | 512 | B | 64.23 ± 9.34 | 3 : 1 | C, D, E, G | | Wang [6] | C | Cross-sectional study | 481 | B | 61 ± 10.3 | 1 : 1 | C, D, G | | Zhen [14] | C | Cross-sectional study | 135 | B | 65.35 ± 4.32 | 2 : 1 | B, F | | Dong [19] | A | Cross-sectional study | 120 | A + B | 64.45 ± 12.33 | 3 : 1 | B | | Yang [15] | A | Cross-sectional study | 200 | B | 61.31 ± 3.24 | 2 : 1 | F, C, D, G, E | | Fu [17] | A | Cross-sectional study | 103 | A + B | 59.39 ± .93 | 1 : 2 | C, F, D | | Guo [18] | C | Cross-sectional study | 158 | A + B | 56.83 ± 6.87 | 1 : 2 | NA | | Huang [23] | D | Cross-sectional study | 114 | A | 64.56 ± 7.46 | 3 : 2 | C, D, E, F | | Meng [21] | C | Cross-sectional study | 111 | A + B | 64.59 ± 6.42 | 2 : 1 | C, D | | Guo [27] | D | Cross-sectional study | 254 | B | 65.36 ± 8.34 | 1 : 2 | E, F, C, D | | Gao [13] | A | Cross-sectional study | 165 | B | 62.1 ± 7.8 | 3 : 1 | C, D | | Xu [14] | A | Cross-sectional study | 150 | A | 54.54 ± 11.35 | 2 : 1 | NA |
|
|
