TABLE 2.

Subgroup analysis of the correlation between bilirubin level and all stroke or ischemic stroke risk.

Subgroups	Stroke risk			Ischemic stroke risk
	Number of groups of data	Pooled OR [95% CI]	Heterogeneity	Number of groups of data	Pooled OR [95% CI]	Heterogeneity
Study design
Cohort	7	0.75 [0.69, 0.82]	I2 = 0%, P = 0.49	4	0.72 [0.64, 0.81]	I2 = 0%, P = 0.74
Cross-sectional	7	0.63 [0.43, 0.91]	I2 = 86.74%, P < 0.01	3	0.74 [0.37, 1.49]	I2 = 93.27%, P < 0.01
Gender
Male	3	0.71 [0.55, 0.91]	I2 = 6.34%, P = 0.34	2	0.68 [0.52, 0.90]	I2 = 0%, P = 0.61
Female	3	0.55 [0.25, 1.18]	I2 = 65.87%, P = 0.05	2	0.64 [0.26, 1.54]	I2 = 61.61%, P = 0.11

OR, odds ratio; CI, confidence intervals.