2.2. Data collection
We used three information sources:
1. Questionnaire. In December 2000, the parents of each
child younger than 13 years of age received a questionnaire,
enquiring about the occurrence of a possible
measles infection in 1999 or 2000. In case of a possibly
positive diagnosis, detailed symptoms of measles virus
infection were obtained and data about GP consultation.
Vaccination status and self-reported complications
were obtained, to identify determinants of GP
consultation. Statements about perceived seriousness
of this illness episode (11 items) and parents’ views on
respiratory tract infections (the need to consult a GP:
three items; perceived self-limiting character: three
items) were rated on a five-point scale (1: strongly
disagree; 5: strongly agree) [13–16]. After 4 weeks a
reminder was sent. A random sample (n 42, 10%)
of nonresponders were interviewed by telephone in a
semistructured way, for motives of nonresponse.
2. GPs’ records. The GPs in Rhenen have been participating
in the University Network Utrecht, and have
been trained extensively to electronically register disease
uniformly according to the International Classi-
fication of Primary Care classification (ICPC) [17].
Patient information derived from the database for scientific
research has been used according the approval
of the medical ethical committee of the Utrecht University.
For all children younger than 13 years, we
performed an electronic search of the GPs’ records
for the ICPC-code A71 (measles) and for free-text
“measles,” in the period ranging from 2 months previous
to the start of the national outbreak, to 2 months
after the end of the national outbreak. The included
patient files were checked (CvI) for dates of first contact
and complications.
2.2. Data collectionWe used three information sources:1. Questionnaire. In December 2000, the parents of eachchild younger than 13 years of age received a questionnaire,enquiring about the occurrence of a possiblemeasles infection in 1999 or 2000. In case of a possiblypositive diagnosis, detailed symptoms of measles virusinfection were obtained and data about GP consultation.Vaccination status and self-reported complicationswere obtained, to identify determinants of GPconsultation. Statements about perceived seriousnessof this illness episode (11 items) and parents’ views onrespiratory tract infections (the need to consult a GP:three items; perceived self-limiting character: threeitems) were rated on a five-point scale (1: stronglydisagree; 5: strongly agree) [13–16]. After 4 weeks areminder was sent. A random sample (n 42, 10%)of nonresponders were interviewed by telephone in asemistructured way, for motives of nonresponse.2. GPs’ records. The GPs in Rhenen have been participatingin the University Network Utrecht, and havebeen trained extensively to electronically register diseaseuniformly according to the International Classi-fication of Primary Care classification (ICPC) [17].Patient information derived from the database for scientificresearch has been used according the approvalof the medical ethical committee of the Utrecht University.For all children younger than 13 years, weperformed an electronic search of the GPs’ recordsfor the ICPC-code A71 (measles) and for free-text“measles,” in the period ranging from 2 months previousto the start of the national outbreak, to 2 monthsafter the end of the national outbreak. The includedpatient files were checked (CvI) for dates of first contactand complications.
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