Table 1 Characteristics of included studies
First author, year (references) | Country | Sample size | Mean age, y | Male (%) | Surgery type | CLNM (%) | Risk factors |
|---|---|---|---|---|---|---|---|
Gui, 2018 [14] | China | 541 | 47.2 | 128 (23.7) | TT/LT + CLND | 148 (27.4) | S, A, TS, M, ETE |
Zhou, 2012 [9] | China | 122 | 48.0 | 60 (49.2) | TT + CLND | 60 (49.2) | S, A, TS |
Yuan, 2017 [10] | China | 295 | 43.0 | 89 (30.2) | TT/LT + CLND | 125 (42.4) | A, M |
Kim, 2012 [15] | Korea | 160 | 47.3 | 19 (11.9) | TT + B-CLND | 61 (38.1) | S, TS |
Park, 2014 [16] | Korea | 193 | 49.2 | 32 (16.6) | TT/LT + CLND | 63 (32.6) | TS, M |
Zhang, 2015 [11] | China | 178 | 46.0 | 37 (20.8) | TT/LT + CLND | 73 (41.0) | S, TS, ETE |
Xu, 2014 [17] | China | 402 | 45.4 | 79 (19.7) | TT/LT + CLND | 156 (38.8) | TS, B, CI |
So, 2010 [18] | Korea | 551 | 50.2 | 111 (20.1) | TT + B-CLND | 202 (36.7) | S, M, ETE |
Caliskan, M 2012 [19] | Korea | 842 | 46.3 | 73 (8.7) | TT/LT + CLND | 218 (25.9) | TS, ETE |