Table 1.

Table 1 Pre-processing of Data Regarding HIS Documents. During the Observation Period (Jan to Dec 2007), 1,299,070 Documents were Generated. 55,745 Documents (4.3%) were Excluded From the Analysis

	Number of Documents	Number of Document Types
Raw dataset	1,299,070	168
Exclusion criteria
<10 documents per document type per year	205	71
local document types for internal use (temporary data)	55,540	11
Analysis dataset	1,243,325	86

HIS = hospital information systems.