Table 3.

Subgroup analysis of the association between circulating TMAO concentrations and all-cause mortality in dialysis patients.

Subgroup	Studies	RR	95%CI	Z	P	Heterogeneity
						I2, %	* P
Age
<60	6 [13,35,47,36]	1.29	0.93,1.80	1.52	0.129	79.0	0.000
>60	2 [42,48]	0.99	0.94,1.04	0.34	0.733	0.000	0.603
Race
Including blacks	4 [42,36,37,48]	0.98	0.94,1.03	0.61	0.542	0.000	0.649
Non-blacks	4 [13,35,47,36]	1.62	1.19,2.22	3.05	0.002	56.7	0.074
Dialysis modality
PD	2 [35,47]	1.32	0.98,1.79	1.82	0.069	0.000	0.928
HD	6 [13,42,36,37,48]	1.19	0.90,1.55	1.23	0.219	82.1	0.000

*For heterogeneity among subgroups.

RR: relative risk; CI: confidence interval.