Table 1

Clinical characteristics by patient group.

	Headache consulters			Referred to neurologist
	Total n	n	%	Total n	n	%	OR (95% CI)^a	P-value^a

Male	488	141	28.9	81	29	35.8	1.38 (0.90 to 2.10)	0.14

	Total n	mean	SD	Total n	mean	SD	Mean difference (95% CI)^a	P-value^a

Age	488	38.9	13.9	81	40.9	13.3	1.90 (−1.27 to 5.06)	0.24
MIDAS^b	243	22.9	30.5	43	28.4	36.8	5.48 (−6.07 to 17.03)	0.35
HIT–6	237	61.3	7.9	42	61.9	8.8	1.12 (−0.86 to 3.10)	0.27
Anxiety (HADS)	241	7.6	4.4	42	6.9	4.7	−0.80 (−2.13 to 0.53)	0.24
Depression (HADS)	238	4.5	3.7	44	4.8	3.3	0.12 (−1.11 to 1.36)	0.85

Caseness	Total n	n	%	Total n	n	%	OR (95% CI)^a	P-value^a

Anxiety (HADS)	241	66	27.4	42	11	26.2	0.88 (0.52 to 1.48)	0.63
Depression (HADS)	238	17	7.1	44	4	9.1	1.13 (0.17 to 7.66)	0.89
Anxiety or depression	237	70	29.5	42	11	26.2	0.79 (0.46 to 1.35)	0.39
MIDAS (moderate/severe)	243	129	53.1	43	25	58.1	1.31 (0.58 to 2.94)	0.51

HIT–6 (substantial/very severe impact)	237	191	80.6	42	33	78.6	1.06 (0.65 to 1.73)	0.85

↵a Estimates adjusted for age and sex; CIs and P-values adjusted for clustering by GP.
↵b Median (inter quartile range) for MIDAS: 12 (3–28) for consulters, 15 (2–38) for referred. HADS = Hospital Anxiety and Depression Scale. HIT = Headache Impact Test. MIDAS = Migraine Disability Assessment Score. OR = odds ratio.