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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