Table 4. Characteristics of included studies.

First author (year)	Location	CT	Instrument	Age (a)1	Gestation(wk)	Trimester	Pregnant	No. eyes (normal pregnant /control)
Takahashi[16] (2013)	Japan	SFCT	Spectralis	30.4/30.0	31.0±3.2	Third trimester	Healthy pregnant	25/27
Sayin[23](2014)	Turkey	SFCT	Cirrus-HD OCT	30.2/28.1	28.0±5.8	Third trimester	Healthy pregnant	46/40
Sayin[23](2014)	Turkey	SFCT	Cirrus-HD OCT	30.5/30.2	29.7±5.5	Third trimester	Preeclampsia	33/40
Goktas[7](2014)	Turkey	SFCT	Spectralis	26.9/29.4	33.1±2.8	Third trimester	Healthy pregnant	30/30
Goktas[7](2014)	Turkey	SFCT	Spectralis	28.5/29.4	7.4±2.6	First trimester	Healthy pregnant	30/30
Garg[14](2014)	USA	SFCT	Spectralis	32.7/37.9	32.5±4.9	Third trimester	Preeclampsia	15/19
Kara[15](2014)	Turkey	SFCT	Cirrus-HD OCT	21.6/22.0	27.3±6.6	Third trimester	Healthy pregnant	100/100
Atas[8](2014)	Turkey	SFCT	Spectralis	27.7/29.0	31.37±4.9	Third trimester	Healthy pregnant	25/26
Atas[8](2014)	Turkey	SFCT	Spectralis	30.8/29.0	38.35±3.1	Third trimester	Preeclampsia	27/26
Ulusoy[22](2015)	Turkey	SFCT	Spectralis	28.0/27.4	31.97±3.77	Third trimester	Healthy pregnant	58/72
Dadaci[13] (2015)2	Turkey	SFCT	Cirrus-HD OCT	28.9/29.2	35.1±1.9	Third trimester	Healthy pregnant	27/25
Dadaci[13](2015)3	Turkey	SFCT	Cirrus-HD OCT	28.9/29.2	35.1±1.9	Third trimester	Healthy pregnant	27/25
Dadaci[13](2015)2	Turkey	SFCT	Cirrus-HD OCT	28.9/29.2	6.8±0.8	First trimester	Healthy pregnant	27/25
Dadaci[13](2015)3	Turkey	SFCT	Cirrus-HD OCT	28.9/29.2	6.8±0.8	First trimester	Healthy pregnant	27/25
Present (2015)	China	SFCT	Spectralis	28.4/27.8	30.2±1.63	Third trimester	Healthy pregnant	46/71

CT: Choroidal thickness; SFCT: Subfoveal choroidal thickness; OCT: Optical coherence tomography. ¹Normal pregnant /control; ²Data from the right eye; ³Data from the left eye.