Table 4. Subgroup analysis of pRNFL thickness according to the type of SD-OCT.

Subgroup	No.	Heterogeneity		WMD (95%CI)	Overall effect
		I2	P		Z	P
Spectralis
Average	6	14.9%	0.319	1.92 (-1.37, 5.22)	1.14	0.252
Superior	5	34.9%	0.189	-10.20 (-16.51, -3.90)	3.17	0.002
Inferior	5	0	0.444	10.11 (4.69, 15.53)	3.66	≤0.001
Nasal	5	0	0.469	-0.38 (-4.63, 3.87)	0.17	0.862
Temporal	5	0	0.870	-3.20 (-7.40, 1.00)	1.50	0.135
Cirrus
Average	3	0	0.983	0.82 (-2.55, 4.19)	0.48	0.632
Superior	2	0	0.922	-5.36 (-12.67, 1.94)	1.44	0.150
Inferior	2	0	0.594	10.57 (2.94, 18.19)	2.72	0.007
Nasal	2	0	1.000	-3.00 (-6.12, 0.12)	1.89	0.059
Temporal	2	0	0.877	0.57 (-3.60, 4.74)	0.27	0.788
Optovue
Average	2	35.3%	0.214	1.92 (-4.32, 8.16)	0.60	0.54 6
Superior	2	59.4%	0.116	1.27 (-17.85, 20.40)	0.13	0.896
Inferior	2	0	0.575	15.33 (5.37, 25.29)	3.02	0.003
Nasal	2	70.1%	0.067	-2.84 (-13.69, 8.01)	0.51	0.607
Temporal	2	0	0.869	-0.93 (-7.76, 5.91)	0.27	0.790

WMD: Weighted mean difference.