Table 2.

Sensitivity analysis by removing one by one the included studies.

Study	OR (95%CI)	I2	p
Bahadoran Z, et al. (2013) [16]	0.87 (0.80–0.93)	38.4%	0.039
Im J, et al. (1). (2020) [17]	0.79 (0.72–0.87)	51.9%	0.003
Im J, et al. (2). (2020) [17]	0.80 (0.71–0.89)	63.1%	$<$0.001
Im J, et al. (3). (2020) [17]	0.80 (0.71–0.89)	63.0%	$<$0.001
Im J, et al. (4). (2020) [17]	0.81 (0.72–0.90)	61.4%	$<$0.001
Kim M, et al. (2020) [18]	0.79 (0.71–0.89)	62.9%	$<$0.001
Eslami O, et al. (2020) [5]	0.83 (0.75–0.91)	60.4%	$<$0.001
Dehghani Firouzabadi F, et al. (1). (2021) [19]	0.81 (0.73–0.89)	62.8%	$<$0.001
Dehghani Firouzabadi F, et al. (2). (2021) [19]	0.82 (0.75–0.91)	61.5%	$<$0.001
Vasmehjani AA, et al. (2021) [27]	0.82 (0.74–0.90)	62.9%	$<$0.001
Azizi-Soleiman F, et al. (1). (2021) [28]	0.80 (0.72–0.89)	63.1%	$<$0.001
Azizi-Soleiman F, et al. (2). (2021) [28]	0.81 (0.73–0.89)	63.2%	$<$0.001
Delshad Aghdam S, et al. (1). (2021) [29]	0.81 (0.74–0.90)	63.0%	$<$0.001
Delshad Aghdam S, et al. (2). (2021) [29]	0.82 (0.74–0.90)	62.5%	$<$0.001
Asgari E, et al. (1). (2021) [20]	0.81 (0.73–0.89)	62.8%	$<$0.001
Asgari E, et al. (2). (2021) [20]	0.82 (0.75–0.91)	61.5%	$<$0.001
Asgari E, et al. (3). (2021) [20]	0.81 (0.73–0.89)	63.0%	$<$0.001
Asgari E, et al. (4). (2021) [20]	0.82 (0.74–0.90)	62.9%	$<$0.001
Asgari E, et al. (5). (2021) [20]	0.81 (0.74–0.90)	63.1%	$<$0.001
Asgari E, et al. (6). (2021) [20]	0.82 (0.75–0.91)	60.5%	$<$0.001
Asgari E, et al. (7). (2021) [20]	0.81 (0.73–0.89)	62.2%	$<$0.001
Asgari E, et al. (8). (2021) [20]	0.82 (0.74–0.90)	61.9%	$<$0.001
Combined	0.81(0.74–0.90)	61.3%	$<$0.001