Table 2.

Evaluation of total effective rate by chi-square and fixed effect model.

Study or subgroup	Experimental		Control		Weight	Risk Difference
	Events	Total	Events	Total		M-H, fixed, 95% CI
Gou Li 2020	45	45	43	45	8.6%	0.04 [-0.03, 0.12]
Li Limei 2019	29	30	21	30	5.8%	0.27 [0.09, 0.44]
Li Qiaoxiang 2017	58	60	52	60	11.5%	0.10 [0.00, 0.20]
Sui Aifeng 2015	45	48	37	48	9.2%	0.17 [0.03, 0.30]
Tang Jianwen 2015	45	48	37	48	9.2%	0.17 [0.03, 0.30]
Wang Long 2017	22	25	18	25	4.8%	0.16 [-0.06, 0.38]
Xue Ming 2018	41	45	39	45	8.6%	0.04 [-0.09, 0.17]
Ye Jianlin 2017	85	90	75	90	17.3%	0.11 [0.02, 0.20]
Yu Tong 2017	38	41	30	40	7.8%	0.18 [0.02, 0.33]
Zhang Xiaoyan 2014	47	50	37	46	9.2%	0.14 [0.00, 0.27]
Zhao Qi 2018	40	42	33	42	8.1%	0.17 [0.03, 0.31]
Total (95% CI)		524		519	100%	0.13 [0.09, 0.17]
Total events	495		422

Heterogeneity: chi² = 11.37; df = 10 (P = 0.33); I² = 12%. Test for overall effect: Z = 6.70 (P < 0.00001).