Table 2.

Studies (n = 28) (identified by first author) evaluating headache care components associated with quality

Author	Process				Outcome
	Diagnosis	Treatment	Management	Services	Clinical symptoms	Impact	Satisfaction
Agostoni [13]	Diagnostic accuracy
Belam [14]						Impact Quality of life
Bigal [15]	Diagnostic rates Investigations
Blumenfeld [16]		Prophylactic	Patient education	Consultations		Quality of life	Physicians’ satisfaction
Blumenthal [17]	Diagnostic accuracy	Acute			Headache severity
Campinha-Bacote [18]			Patient education Recognition of triggers		Headache severity Headache frequency	Economic burden Work productivity	Patient satisfaction
Clarke [19]	Diagnostic accuracy Investigations
Clarke [20]	Diagnostic accuracy Investigations	Treatment generally			Headache improvement or deterioration
Davies [22]	Investigations				Pain severity		Patient satisfaction
Dowson [22]	Diagnostic rates Investigations	Acute Prophylactic
Elsner [23]	Diagnostic rates		Physician education		Pain severity
Gahir [24]				Consultations (GP and pharmacist)
Gahir [25]			Consultations (emergency department)
Harpole [26]		Acute Prophylactic		Referrals		Disability Quality of life	Patient satisfaction
Harpole [27]		Prophylaxis		Consultations (emergency department)		Disability
Karli [28]	Diagnostic accuracy	Acute Prophylaxis	Physician education
Larner [29]		Prescription rates		Consultations (GP)
Latinovic [30]		Prescription rates		Consultations (GP) Referrals
Magnusson [31]					Headache frequency Headache severity	Disability Quality of life
Maizels [32]	Diagnostic rates	Prescription rates Acute Prophylaxis OTC use		Consultations (emergency department)
Maizels [33]	Diagnostic rates	Acute medication Prescription rates
Matchar [34]			Patient education			Disability Quality of life Depression
Melchart [35]	Diagnostic rates	Medication use			Pain intensity Pain frequency	Functional ability Quality of life Health-related behavior
Offredy [36]							Patient satisfaction
Ridsdale [37]				Cost of service			Patient satisfaction
Soon [38]	Diagnostic rates	Acute medication Prophylactic medication				Disability Quality of life
Vincent [39]	Diagnostic accuracy	Prophylactic medication
Zeeberg [40]	Diagnostic rates	Acute medication Prophylactic medication		Referrals	Headache frequency

The quality domain ‘structure’ is not represented in the table as none of the articles addressed this domain

OTC over-the-counter medication