Evaluation of data completeness in the electronic health record for the purpose of patient recruitment into clinical trials: a retrospective analysis of element presence

Table 1 Selection of trials included into our study

Hospital	Study identifier	Disease	Parent population	Number of criteria
Münster	NCT01177033	intermittent claudication	299	18
Münster	NCT00976222	pigment epithelial detachment	3330	25
Münster	NCT00961142	acute leukemia	2065	39
Erlangen	NCT00866684	skin cancer	10589	21
Erlangen	NCT00025402	chronic myelogenous leukemia	1806	16
Erlangen	NCT00310583	mechanical hyperalgesia	4438	31
Heidelberg	NCT01165671	primary glioblastoma	22280	22
Heidelberg	NCT00176150	anorexia nervosa	22280	3
Heidelberg	NCT00750971	lupus erythematosus	22280	21
Düsseldorf	NCT00798525	critical illnesses	708	13
Düsseldorf	NCT00933374	urothelial carcinoma	2091	40
Düsseldorf	NCT00977132	myelodysplastic syndrome	2351	30
Gießen	DOI 10.1111/j.1365-2044.2012.07303.x	general anaesthesia	5500	7
Gießen	NCT01146821	sepsis	208	49
Gießen	DRKS00003264	abdominal surgery	5500	16

Detailed legend: Each participating hospital selected 3 clinical trials, for which the study identifier, the disease under investigation, as well as the size of the parent population and the number of eligibility criteria are given in this table. Study identifiers beginning with NCT are related to clinicaltrials.gov and the identifier beginning with DRKS relates to the German register germanctr.de. One trial was not registered and thus has no identifier. For this study we show the digital object identifier (DOI) of the publication of the trial’s results. The parent population includes all patients admitted in the fourth quarter of 2011 to the clinical department that conducted the trial.

ISSN: 1472-6947