The lack of information on occupation represents the main limitation of our study in which the occupation was unknown for one-third of the population, more often for female patients (39.8%) than for male patients (21.5%), and less often for patients treated in reference centres (23.9%) than in the others (35.0%).
The main problems are the availability of death certificates and the quality of the information on occupation in mortality of statistics.
In our study we did not collect information on occupation of the father.
An overview of information on occupation, PPE use, influenza vaccination status, respiratory symptoms, H5-titres, H1-titres and H3-titres of these 5 participants is presented in Table 4.
We collected information on occupation, intake of homegrown vegetables, smoking, and medical history by questionnaire.
Information on occupation, further details of typical work activities and the nature of their employment (full time or part time) will be sought in follow-up questionnaires.
For those in paid employment, information on occupation, further details of typical work activities and the nature of their employment (full time or part time) will be requested.
In addition to demographic data, this form elicited information on occupation, date(s) of exposure to suspected cases, travel history after February 20, dates of onset of various symptoms, results of blood tests, and chest radiographic findings.
In many cases, there were archival records giving details of name, family connections, date of death and, occasionally, information on occupation or symptoms.
Of the total number of eligible 8929 employed suicide cases available in the NCIS data over the period 2001 2010, 64 cases (less than 1 %) were not able to be coded due to unclear information on occupation, leaving a total of 8865 suicide cases.
