The data-collection procedures for the Coronary event registration data component of the WHO MONICA Project are described in the MONICA Manual, Part IV, Section 1.
The data were transferred from the MONICA Collaborating Centres (MCCs) to the MONICA Data Centre (MDC) using two versions of the Core data transfer format - coronary events (Form 01):
In the Basic analysis data set of the MONICA Archive, all coronary event registration data are given in a standardised format, which is specified in the Data archive format - coronary events (Form 01, Version 6). The Data archive format includes the data items of both versions of the Core data transfer format, with the exception that the day of birth is blinded and only the month and year of birth are given. This is done in order to comply with the personal data confidentiality laws of some countries. Furthermore, all years are given in four characters (e.g. 1987 rather than 87), to avoid confusion after the year 2000.
A number of derived data items have been added:
The acute coronary care data were transferred from the MCCs to the MDC using two versions of the Core data transfer format - acute coronary care (Form 02):
In the Basic analysis data set of the MONICA Archive, all acute coronary care data are given in a standardised format, which is specified in the Data archive format - acute coronary care (Form 02, Version 7). The Data archive format includes the data items of the two versions of the Data transfer format, with the exception that the day of birth is blinded and only the month and year of birth are given. Also, all years are given in four characters (e.g. 1987 rather than 87). A data item for the version number of the data transfer format in which the data were transferred to the MDC has been added at the end of the record.
For most data analyses, the acute coronary care data needs to be linked with the coronary event data. The key data items, which enable the linkage, are CENTRE, RUNIT and SERIAL (see the data archive formats).
The quality of the data, as well as MCC specific characteristics of the data or the data-collection procedures are described in two quality assessment reports:
It is important that anyone who intends to analyse the MONICA data is familiar with the relevant quality assessment reports.
Descriptive statistics calculated from the data as well as commonly used definitions of derived data items can be found in:
A 20% sample (5% for MCC 39) of the coronary event registration data, in the format specified in the Data archive format - coronary events (Form 01, Version 6), can be found in the file:
This sample analysis data set was extracted from the Basic Analysis Data Set of the MONICA Archive using systematic sampling. The file includes the coronary events of the MONICA Reporting Units and calendar years specified in Table 1 and Table 2 of the report "Quality assessment of coronary event registration data in the WHO MONICA Project". Tabulations of the distributions of the data included in the file are given in document Distributions of the data on form 01 - coronary events.
The acute coronary care data for the events included in the sample analysis data set of coronary event registration data, in the format specified in the Data archive format - acute coronary care (Form 02, Version 7), can be found in the file:
The file includes the acute coronary care records which were submitted to the MDC from the MCCs specified in Table 1 of the report "Quality assessment of acute coronary care data in the WHO MONICA Project". It is strongly recommended that most data analyses be restricted to the Reporting Units and periods specified in the table. Tabulations of the distributions of the data included in the file are given in document Distributions of the data on form 02 - acute coronary care.