Table 2. Subgroup analysis assessing APLA and the risk of RVO by characteristics of included studies.

Subgroup	No. of studies	Summary OR (95% CI)	Heterogeneity
			I 2 score (%)	P value
All studies	11	5.18 [3.37, 7.95]	0.00	0.909
Geographic location
Europe	4	5.72[1.88, 17.40]	0.00	0.812
America	3	3.87 [1.68, 8.88]	0.12	0.322
Asia	3	6.65 [3.29, 13.42]	0.00	0.840
Africa	1	4.82 [1.74, 13.39]	N/A	N/A
Control source
Healthy controls	8	6.11[3.73, 10.01]	0.00	0.998
Without RVO	3	3.21 [1.24, 8.29]	12.70	0.318
No. of subjects
> 100	8	5.62 [3.34, 9.46]	0.00	0.990
< 100	3	4.61 [1.75, 12.13]	0.00	0.909