Table 3.

- The ONSD measurements by headache development.

Time	Headache		P-value*
	No	Yes
	Median (Min-Max)	Median (Min-Max)
Right
T3 ONSD	5.1 (4.2-6.0)	5.6 (5.2-6.0)	<0.001
T3 ETD	22.0 (20.0-24.0)	22.0 (21.0-23.0)	0.513
T3 ONSD/ETD ratio	0.23 (0.19-0.27)	0.25 (0.23-0.27)	<0.001
Left
T3 ONSD	5.1 (4.2-5.9)	5.6 (5.2-6.0)	<0.001
T3 ETD	22.0 (19.5-24.0)	22.0 (21.0-23.0)	0.627
T3 ONSD/ETD ratio	0.23 (0.19-0.27)	0.25 (0.23-0.27)	<0.001

^*Mann-Whitney U test.

ONSD, optic nerve sheath diameter; ETD, eyeball transverse diameter.