Table 4.

Results of subgroup analysis and other endpoints.

Factors	Categories	No.of studies	fQRS group	No-fQRS group	OR/MD(95%CI)	Model used	Heterogeneity
			Events/total	Events/total			I2	p-value
Difference endpoints of mortality
In-hospital mortality	All-cause	6	153/1,168	64/1,564	3.77 [2.06, 6.91]	Random	63	<0.0001
	Cardiovascular	5	40/409	29/1,276	4.31 [1.75, 10.64]	Random	58	0.002
Long-term mortality	All-cause	4	61/807	38/1,427	4.42 [1.68, 11.60]	Random	75	0.003
	Cardiovascular	8	116/992	79/1,729	3.22 [1.79, 5.80]	Random	66	<0.0001
Subgroup for main endpoints
In-hospital mortality	All	11	185/1,612	92/2,607	3.32 [2.20, 5.01]	Random	58	0.008
	An arbitrary ECG group	3	35/493	2/737	23.32 [6.38, 85.20]	Random	0	0.8
	Specific time group	8	150/1,119	90/1,870	2.77 [2.06, 3.72]	Random	0	0.64
	History of MIa	9	154/1,276	84/2,132	3.30 [2.05–5.29]	Random	48	0.05
	First MI	3	59/518	12/1,121	12.91 [3.07–54.19]	Random	75	0.02
	QRS duration <120 mms	9	145/1,317	75/2,681	4.32 [2.57–7.26]	Random	55	0.02
	QRS duration Including≥120 mms	2	54/386	19/249	3.74 [0.43,32.41]	Random	61	0.11
	Retrospective	8	169/1,310	85/2,141	3.39 [2.24, 5.14]	Random	44	0.08
	Perspective	3	30/393	9/789	7.83 [0.80, 76.36]	Random	77	0.01
	NSTEMIb	1	2/85	7/348	1.17 [0.24, 5.75]	Random	/	/
	STEMIc	8	157/1,449	68/2,451	4.92 [2.93, 8.28]	Random	53	0.03
Long-term mortality	NSTEMI	4	44/507	30/742	3.44 [2.04, 5.80]	Random	0	1
	STEMI	2	42/244	35/712	4.91 [0.82, 29.44]	Random	91	0.0001
	History of MI	7	109/1,098	82/1,736	2.64 [1.92,3.62]	Random	0	0.71
	First MI	2	26/187	16/436	2.77 [0.13–58.56]	Random	94	0.0001
	QRS duration <120 mms	8	133/1,015	98/1,954	2.90 [1.71–4.93]	Random	68	0.002
	QRS duration Including≥120 mms	1	2/270	0/218	4.07 [0.19–85.20]	Random	/	/
	Retrospective	4	52/575	40/783	2.60 [1.64, 4.12]	Random	0	0.67
	Perspective	4	66/417	43/946	3.24 [1.14, 9.22]	Random	82	0.0007
In-hospital MACE	QRS duration Including≥120 mms	1	55/217	9/118	3.32[1.70–6.48]	Random	/	/
	QRS duration <120 mms	4	103/407	87/868	2.19[1.39–3.44]	Random	23	0.27
	History of MI	5	165/632	87/788	2.01 [1.40–2.88]	Random	41	0.15
	First MI	1	15/91	20/323	2.66 [1.42,4.99]	Random	/	/
Long-term MACE	QRS duration Including≥120 mms	1	57/270	29/210	1.67 [1.02,2.72]	Random	/	/
	QRS duration <120 mms	6	262/548	131/802	4.45 [2.56,7.72]	Random	75	0.001
	History of MI	5	210/582	101/527	3.12 [1.62–6.02]	Random	78	0.001
	First MI	2	109/236	59/485	5.85 [3.96–8.64]	Random	0	0.39
Others endpoints
VT/VFd	/	6	128/763	95/1,455	2.76 [1.72,4.43]	Random	57	0.04
Heart failure	/	5	158/839	115/1,188	1.65 [1.02,2.66]	Random	64	0.03
TVLe	/	7	327/796	287/1,188	2.14 [1.31–3.51]	Random	79	<0.0001
LVEFf	/	13			−5.47 [−7.03,−3.91]	Random	84	<0.00001

^aMI myocardial infarction;

^bNSTEMI Non-ST-segment elevation myocardial infarction;

^cSTEMI ST-segment elevation myocardial infarction;

^dVT/VF Ventricular tachycardia/ventricular fibrillation;

^eTVL Triple vessel lesion;

^fLVEF Left ventricular ejection function.