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. 2016 May 18;5(5):e003200. doi: 10.1161/JAHA.116.003200

Table 2.

Stratification of the Studies: Retrospective and Prospective

	No. of Studies	OR (95% CI)	Heterogeneity
CAD
Retrospective studies	8	0.37 (0.18, 0.76; P=0.007)	I²: 84%; P<0.001
Prospective studies	7	0.30 (0.07, 1.32; P=0.11)	I²: 87%; P<0.001
CABG
Retrospective studies	15	0.45 (0.35, 0.59; P<0.001)	I²: 59%; P=0.002
Prospective studies	1	0.43 (0.02, 7.90; P=0.57)	Not evaluable
Mortality
Retrospective studies	13	0.57 (0.34, 0.94; P=0.03)	I²: 72%; P<0.001
Prospective studies	3	1.08 (0.41, 2.86; P=0.88)	I²: 0%; P=0.95

CABG indicates coronary artery bypass grafting; CAD, coronary artery disease; OR, odds ratio.