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Table 2 Overview of data structure

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

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