Table 2.

Scores of participants on the Kessler 6-item psychological distress scale

K6 item	Migraine patients	Healthy controls	P
Nervous	1 (4,0)	0 (4,0)	< 0.001
Hopeless	1 (3,0)	0 (4,0)	< 0.001
Restless or fidgety	1 (4,0)	0 (3,0)	< 0.001
So depressed that nothing could cheer you up	1 (4,0)	0 (3,0)	< 0.001
Everything is an effort	1 (2,0)	0 (2,0)	< 0.001
Worthless	0 (1,0)	0 (2,0)	0.598
Total score	5 (18,0)	0 (16,0)	< 0.001
Severe psychological distress (n,%)	25 (17%)	12 (8%)	0.016

Values are median (maximum, minimum) or n (%)