Table 3. Subgroup analyses on the risk of uveitis in psoriatic arthritis.

Subgroup analysis	No. of datasets	Pooled estimates (random-effects model)
		Relative risk (95%CI)	P	I2
Psoriasis without psoriatic arthritis	4	1.49 (1.08-2.07)	0.016	91.1%
Region
USA	2	1.43 (1.20-1.69)	0.000	0
Others	2	1.56 (0.86-2.85)	0.147	96.9%
Age
Children	1	1.35 (0.52-3.51)	0.538	-
Adults	2	1.74 (1.18-2.58)	0.006	89.1%
Children and adults	1	1.16 (1.06-1.26)	0.001	-
Statistical analysis
Cox-proportional hazards model	2	1.27 (1.03-1.56)	0.024	78.0%
Poisson regression model	2	2.10 (1.74-2.53)	0.000	0
Psoriatic arthritis	6	3.16 (2.16-4.63)	0.000	83.8%
Region
USA	3	4.63 (2.11-10.16)	0.000	89.2%
Others	3	2.46 (1.71-3.55)	0.000	64.3%
Age
Children	1	22.36 (7.04-71.02)	0.000	-
Adults	4	2.97 (2.16-4.08)	0.000	62.8%
Children and adults	1	1.95 (1.61-2.37)	0.000	-
Statistical analysis
Cox-proportional hazards model	3	2.55 (1.69-3.86)	0.000	85.7%
Poisson regression model	3	4.89 (2.03-11.78)	0.000	82.9%