Variables | Number of studies | Heterogeneity | Model | MD | 95% CI | P | Psub | |
---|---|---|---|---|---|---|---|---|
I2 | Lower | Upper | ||||||
Countries | Â | Â | Â | Â | Â | Â | Â | 0.30 |
 China | 7 | 93% | RE | 52.76 | 36.52 | 69.01 | <0.00001 |  |
 Japan | 3 | 79% | RE | 70.66 | 48.09 | 93.24 | <0.00001 |  |
 ROK | 4 | 97% | RE | 78.29 | 52.02 | 104.57 | <0.00001 |  |
Type of gastrectomy | Â | Â | Â | Â | Â | Â | Â | 0.03 |
 Distal gastrectomy | 8 | 96% | RE | 75.41 | 56.40 | 94.43 | <0.00001 |  |
 Total gastrectomy | 1 | - | RE | 40.00 | 22.57 | 57.43 | <0.00001 |  |
 Undifferentiateda | 7 | 90% | RE | 52.63 | 38.00 | 67.26 | <0.00001 |  |
Stages | Â | Â | Â | Â | Â | Â | Â | 0.23 |
 EGC or stage I | 8 | 95% | RE | 68.19 | 50.65 | 85.73 | <0.00001 |  |
 AGC | 4 | 94% | RE | 47.06 | 27.43 | 66.68 | <0.00001 |  |
 Mixtureb | 4 | 90% | RE | 68.81 | 42.08 | 95.54 | <0.00001 |  |