Table 4:

Comparison between analysis in CABG and Valve Surgery

(a) SMDs
	CABG				Valve Surgery
	I2	Number of studies	Number of subjects	Std. Mean Difference [IV, Random, 95% CI]	I2	Number of studies	Number of subjects	Std. Mean Difference [IV, Random, 95% CI]
Age	33	11	20,594	0.49 [0.39, 0.59]*	0	2	197	0.73 [0.42, 1.04]*
LA diameter	92	6	777	0.39 [−0.25, 1.02]	0	1	63	0.43 [−0.09, 0.96]
Ejection Fraction	79	7	19,452	−0.35 [−0.60, −0.11]*	0	2	197	−0.28 [−0.58, 0.02]
BMI	0	4	18,947	0.00 [−0.03, 0.04]	0	2	197	0.12 [−0.18, 0.42]
(b) Pooled ORs
	CABG				Valve Surgery
	I2	Number of studies	Number of subjects	Odds Ratio [M-H, Random, 95% CI]	I2	Number of studies	Number of subjects	Odds Ratio [M-H, Random, 95% CI]
History of HF	45	4	31,946	1.57 [1.38, 1.79]*	0	1	244	0.68 [0.39, 1.19]
COPD	50	9	33,468	1.29 [1.05, 1.59]*	36	2	307	1.44 [0.46, 4.52]
Hypertension	44	13	34,421	1.31 [1.13, 1.52]*	53	3	441	1.54 [0.74, 3.18]
History of MI	45	7	32,406	1.21 [1.07, 1.37]*	0	1	244	1.33 [0.38, 4.69]
Diabetes	0	14	34,534	1.06 [1.00, 1.12]*	61	3	441	1.72 [0.65, 4.54]
β-blocker use	50	12	15,960	1.01 [0.79, 1.29]	0	3	441	1.88 [1.22, 2.89]*
Male gender	43	14	34,534	1.00 [0.86, 1.15]	29	3	441	0.82 [0.49, 1.39]
Dyslipidemia	0	5	1,329	0.96 [0.73, 1.25]	82	2	197	1.03 [0.21, 5.09]

^*significant difference at the 0.05 test level

IV=inverse variance, M-H=Mantel-Haenszel, BMI=body mass index, LA=left atrial, COPD=chronic obstructive pulmonary disease, MI=myocardial infarction, HF=heart failure