Before the investigation started, a pilot study was performed to develop a data registration form at one PHC centre.
Age, sex, time, place, cause and witness of arrest, BLS/ALS, out-of-hospital intubations, transportation vehicle, CPR outcome and final status of patients were gathered in a data registration form.
Fifth, although the data registration forms included a section for reporting the decision to limit treatment and withdraw life support, the lack of a valid unified 'do not resuscitate' protocol for all the ICUs participating in the study makes it impossible to reach conclusions about the influence of this type of decisions on hospital mortality in our series.
Police records and inquest reports; Official records of death: Mortuary data, death registration forms, medical/medico-legal autopsy reports; Primary autopsy data: Verbal or psychological autopsy data collected for the study.
Then, the Eye Disease Prevention Centers in 19 districts gathered the data from registration forms into "A Database of Cataract Surgery in Shanghai" and reported the data to the Shanghai Eye Disease Prevention & Treatment Center twice a year.
To minimize selection bias, patients with missing data (eg, treatment registration form not yet completed) were included.
All three databases in Denmark, Norway, and Sweden have identical data fields, corresponding to the registration form, but the data entry interface varies.
Using the registration form, data were collected about patient characteristics.
It also led to the conclusion that important data could in fact be retrieved from other supplementary data sources, as described in the paper by Thomsen et al. 4 Thus, it was finally decided not to register blood pressure, height, weight, and any other clinical data on the DD2 registration form as they could be found in other databases accessible to DD2.
Further, we have no comparison of traditional event detection using clinical follow-up by phone call or outpatient visits and data registration by clinical research forms versus our proposed health care database-based event detection.
The patient registration form records data on gender, date of birth, disease subsets as well as information on organ involvement, antibodies or current symptoms as published previously [ 7].
