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Table 1 Baseline characteristics of included studies

From: Mean value of B-mode optic nerve sheath diameter as an indicator of increased intracranial pressure: a systematic review and meta-analysis

Study/year Region Design Sample size Mean Ultrasound brand Clinical setting Diagnosis Etiology Measurement technique
Aduayi 2015 [9] Nigeria Prospective 69 5.7 Mindray DC-6 Mixed CT Mixed 3 mm behind the globe; 3 times per eye; averaged
Altayar 2020 [10] Saudi Arabia Prospective 28 6.6 Unspecified ICU Inv Trauma 3 mm posterior to the globe in transverse and sagittal planes in both eyes; average diameter was recorded
Bhadari 2019 [11] India Prospective 57 5.8 Unspecified OR Inv Hydrocephalus 3 mm behind the posterior sclera
Blaivas 2003 [12] USA Prospective 14 6.27 Unspecified ED CT Mixed 3 mm posterior to the globe for both eyes and then averaged.
Bäuerle 2011 [13] Finland Prospective 10 6.4 Philips iU22 Mixed LP IIH 3 mm behind the papilla. Measured 3 times and then averaged.
Chen 2019 [14] China Prospective 29 4.53 DelicaMVU-6300 Mixed LP Mixed 3 mm behind the globe; averaged two measurements: one sagittal and the other in the transverse plane
del Saz-Saucedo 2016 [15] Spain Prospective 19 6.76 Toshiba AplioXG Mixed LP IIH Transverse plane
Du 2020 [16] China Prospective 49 5.7 Sonosite ICU Inv Trauma 3 mm behind the globe; transverse plane; averaged two eyes.
Geeraerts 2007 [17] France Prospective 15 6.3 HP Sonos 5500 ICU Inv Trauma 3 mm behind the globe; one sagittal and one transverse
Goel 2008 [18] India Prospective 73 5.8 Unspecified Mixed CT Trauma 3 mm behind the globe; one sagittal and one transverse; averaged
Hanafi 2019 [19] Iran Prospective 62 6.06 SONOSCAPE-SSI 6000 ED CT Trauma 3 mm posterior to the globe; 3 times on each eye in an axial region; averaged.
Kimberly 2008 [20] USA Prospective 8 5.4 Sonosite Micromaxx Mixed Inv Mixed 3 mm posterior to the orbit; axial image; six measurements; averaged.
Komut 2016 [21] Turkey Prospective 50 5.4 Toshiba Aplio 500 Platinum ED CT Mixed 3 mm proximal to the optic disc; in transverse and sagittal planes.
Mohson 2019 [22] Iraq Prospective 40 5.6558 Philips HD11XE Clinic LP Mixed 3 mm posterior to the globe; transverse.
Moretti 2009 [23] Italy Prospective 19 6.2 Hitachi EUB 405 ICU Inv Trauma 3 mm behind the globe; one sagittal and one transverse.
Nash 2015 [24] USA Prospective 9 5.8 SonoSite M-Turbo Mixed Inv Trauma 3 mm posterior to the optic disk; longitudinal and transverse.
Rehman 2016 [25] Pakistan Cross-sectional 13 6.61 Toshiba Xario 200 Mixed LP IIH 3 mm behind the retina; 3 readings were averaged.
Shirodikar 2014 [26] India Prospective 35 5.43 Unspecified Mixed MRI Mixed 3 mm behind the globe; averaging three readings from each eye.
Tarzamni 2016 [27] Iran Prospective 30 5.48 Aloka Model Prosound 3500 Mixed CT Mixed 3 mm posterior to the globe; transverse and sagittal; averaged.
Ussahgij 2020 [28] Thailand Prospective 29 5.3 SonoSite M-Turbo ED CT Mixed 3 mm posterior.
Wang 2015 [29] China Cross-sectional 101 4.58 Philips iU22 Mixed LP Mixed 3 mm posterior to the orbit; transverse and sagittal; repeated twice; averaged
Zoerle 2020 [30] Italy Prospective 20 6.44 Phillips iE33 ICU Inv Trauma 3 mm behind the globe; transverse and sagittal; repeated twice; averaged