Table 6.

Sensitivity analysis based on the duration of angina attacks.

	Group	No. of RCTs	No. of patients	MD	95%CI	Z	P (effect)	I2	χ2	P (het)
M scale	0–5	3	342	−2.56	−3.45, −1.66	5.62	<0.00001	87%	15.45	0.0004
	1–5	3	342	−2.56	−3.45, −1.66	5.62	<0.00001	87%	15.45	0.0004
	2–5	3	342	−2.56	−3.45, −1.66	5.62	<0.00001	87%	15.45	0.0004
	3–5	3	342	−2.56	−3.45, −1.66	5.62	<0.00001	87%	15.45	0.0004
	4–5	1	60	−4.67	−6.07, −3.27	6.53	<0.00001	/	/	/
	≤ 3	4	282	−2.00	−2.39, −1.61	9.99	<0.00001	50%	2.00	0.16
	> 3	1	60	−4.67	−6.07, −3.27	6.53	<0.00001	/	/	/