Profiling quality of care for patients with chronic headache in three different German hospitals – a case study

Table 2 Overview of data structure

	Hospital A	Hospital B	Hospital C
	Number of patients
Screened for study	246	192	129
Meeting the inclusion/exclusion criteria	126	151	103
Missing data:
- Patient questionnaire missing at admission*	3	20	0
- Patient questionnaire missing at discharge*	14	14	5
- Baseline diary missing*	12	11	1
For main statistical analysis**	99	109	98
With 6-month follow-up data including headache diary	59	60	82

* multiple specifications possible
** patient questionnaires at admission, at discharge and baseline headache diary mandatory

ISSN: 1472-6963