Table 4. Sensitivity analysis of success rate.

		Heterogeneity			Meta-analysis
	No. of studies	I 2 (%)	P	Model	Risk ratio	95% CI
Subgroup analysis
Anesthesia of infiltration anesthesia
intraseptal anesthesia	2	74	0.05	Random-effect	0.91	0.68–1.23
supraperiosteal anesthesia	4	84	0.0004	Random-effect	0.98	0.71–1.34
subperiosteal infiltration	1	NA	NA	NA	1	0.75–1.34
Sample size
≤30	2	0	1.00	Random-effect	1.00	0.89–1.12
>30	5	80	0.0006	Random-effect	0.94	0.72–1.22
Adrenaline concentration
1:80000	3	81	0.006	Random-effect	1.02	0.56–1.84
1:100000	3	69	0.04	Random-effect	0.87	0.71–1.07
1:200000	1	NA	NA	NA	1.36	1.04–1.79
Sensitivity analysis
Brkovic et al., 2010 excluded	6	77	0.0006	Random-effect	0.94	0.76–1.17
Subramaniam et al., 2018 excluded	6	77	0.0006	Random-effect	0.96	0.79–1.16
Meechan 2002 excluded	6	63	0.02	Random-effect	0.97	0.85–1.11
Al-Shayyab et al., 2017 excluded	6	68	0.009	Random-effect	1.00	0.84–1.19
Jain 2018 excluded	6	75	0.001	Random-effect	0.95	0.76–1.18
Ryalat 2018 excluded	6	79	0.0002	Random-effect	0.90	0.74–1.11
Biocanin 2013 excluded	6	72	0.003	Random-effect	1.00	0.84–1.19