Table 4.

Sensitivity analysis based on the outcome measure ECG.

	Group	No. of RCTs	No. of patients	RR	95%CI	Z	P (effect)	I2	χ2	P (het)
M scale	0–5	8	660	1.32	1.20, 1.44	6.00	<0.00001	16%	8.30	0.31
	1–5	8	660	1.32	1.20, 1.44	6.00	<0.00001	16%	8.30	0.31
	2–5	8	660	1.32	1.20, 1.44	6.00	<0.00001	16%	8.30	0.31
	3–5	8	660	1.32	1.20, 1.44	6.00	<0.00001	16%	8.30	0.31
	4–5	4	282	1.29	1.13, 1.47	3.83	0.0001	16%	3.58	0.31
	≤ 3	4	378	1.34	1.18, 1.52	4.62	<0.00001	31%	4.33	0.23
	> 3	4	282	1.29	1.13, 1.47	3.83	0.0001	16%	3.58	0.31