Table 2. Subgroup meta-analysis of uric acid levels and adjusted risk of incident hypertension^*.

Subgroup	No. of included studies	Heterogeneity test(I 2, P)	Summary RR (95% CI)
Categorical data
Sex
Female	6	0.0%, P = 0.770	1.66 (1.46–1.88)
Male	12	68.3%, P<0.001	1.49 (1.31–1.68)
Ethnicity
Asian	7	68.8%, P = 0.004	1.53 (1.32–1.78)
Non-Asian	10	83.7%, P<0.001	1.45 (1.23–1.72)
Follow-up
<5 years	4	70.7%, P = 0.017	1.27 (1.12–1.45)
≥5 years	13	66.5%, P<0.001	1.57 (1.39–1.78)
Sample size
<3000	9	60.0%, P = 0.010	1.45 (1.24–1.70)
≥3000	8	87.1%, P<0.001	1.51 (1.29–1.76)
Continuous data
Sex
Female	5	21.4%, P = 0.278	1.12 (1.05–1.19)
Male	9	64.9%, P = 0.004	1.15 (1.08–1.21)
Ethnicity
Asian	7	91.8%, P<0.001	1.22 (1.10–1.34)
Non-Asian	8	52.4%, P = 0.040	1.14 (1.08–1.21)
Follow-up
<5 years	4	59.9%, P = 0.058	1.31 (1.16–1.48)
≥5 years	11	76.7%, P<0.001	1.14 (1.08–1.19)
Sample size
<3000	8	81.8%, P<0.001	1.20(1.09–1.32)
≥3000	7	78.2%, P<0.001	1.17 (1.10–1.24)

*The variables adjusted in each primary study were shown in Table S1.