Table 5. Meta-regression analysis.

Variable	Coef.	Std. Err.	p value	95% Conf.Interval
Operative time
Study quality	-37.321	7.013	0.034	-67.494 to -7.146
Simple sizes	0.022	0.107	0.857	-0.4391 to 0.483
year of publication	0.257	7.981	0.977	-34.085 to 34.598
country of patients	-46.490	25.357	0.208	-155.595 to 62.614
stage of gastric cancer	42.472	35.851	0.358	-111.782 to 196.725
Blood loss
Study quality	-34.315	17.923	0.306	-262.054 to 193.423
Simple sizes	-0.029	0.014	0.297	-0.213 to 0.155
year of publication	-1.387	6.972	0.875	-89.974 to 87.200
country of patients	-8.324	41.831	0.875	-539.844 to 523.196
stage of gastric cancer	34.315	17.923	0.306	-193.423 to 262.054
Harvesed Lymph nodes
Study quality	-0.879	1.445	0.586	-5.479 to 3.720
Simple sizes	-0.002	0.002	0.337	-0.007 to 0.003
year of publication	-0.749	0.265	0.066	-1.591 to 0.093
country of patients	-3.445	1.214	0.066	-7.308 to 0.418
stage of gastric cancer	1.73	2.035	0.458	-4.747 to 8.206
Hospital stay
Study quality	-0.912	1.996	0.679	-9.111 to 7.287
Simple sizes	0.001	0.002	0.675	0.008 to 0.010
year of publication	0.458	0.115	0.058	-0.037 to 0.953
country of patients	1.233	2.523	0.674	-9.648 to 12.115
stage of gastric cancer	-0.216	3.054	0.950	-13.354 to 12.922
Anastomotic stricture
Study quality	-2.582	1.112	0.259	-16.712 to 11.548
Simple sizes	0.012	0.005	0.245	-0.048 to 0.071
year of publication	-0.176	0.724	0.848	-9.377 to 9.025
country of patients	-3.957	1.732	0.263	-25.962 to 18.047
stage of gastric cancer	3.115	3.337	0.522	-22.746 to 45.519