Table 1

General characteristics of the included studies in the meta-analysis

Study	Country	Study design	Number of eyes	Age(years)	OCTA device	Scan size	Pregnancy period (weeks)	NOS score
Yildirim et al18	Turkey	Cross-sectional study	Pregnancy: 40 Controls: 40	Pregnancy: 28.80±5.27 Controls: 29.23±5.39	Optovue	SCPVD, DCPVD: 6×6 mm FAZ: 3×3 mm	34 (28–41)	7
Hepokur et al19	Turkey	Prospective, cross-sectional study	Pregnancy: 97 controls: 34	Pregnancy: 30.32±6.34 Controls: 29.38±7.03	Optovue	6×6 mm	34.47±3.34	6
Pota and Apaydın20	Turkey	Cross-sectional study	Pregnancy: 41 Controls: 45	Pregnancy: 30.8±5.9 Controls: 29.7±5.9	Topcon	6×6 mm	31±2	7
Chanwimol et al21	USA	Prospective, case–control study	Pregnancy: 19 Controls: 44	Pregnancy: 36±7 Controls: 35±8	Optovue	3×3 mm	33±3	7
Su et al22	USA	Prospective, case–control study	Pregnancy: 22 Controls: 23	Pregnancy: 32.27±6.96 Controls: 30.08±5.49	Heidelberg	10°×10°	33±3.59	7

DCP VD, deep capillary plexus vascular density; FAZ, foveal avascular zone; NOS, Newcastle-Ottawa Scale; OCTA, optical coherence tomography angiography; SCP VD, superficial capillary plexus VD.