title: Prevalence of respiratory symptoms in school children and salivary IgA--an epidemiological study in a rural area of Northrhine-Westphalia, Germany.
abstract: An elevated frequency of wheezing was found in school children in a rural area of Northrhine-Westphalia, Germany (Duhme and Keil, Institut für Epidemiologie und Sozialmedizin, Universität Münster, Münster, Germany 1997). In this study the prevalence of wheezing was reinvestigated by including main influencing factors. A cross-sectional survey was performed in all school children visiting school classes 1, 2 and 7, 8 (n = 1161). Two corresponding questionnaires were used: a parental questionnaire and a questionnaire for self-completion by the children aged 12-15. The latter included the ISAAC video questionnaire. The levels of immunoglobulins A, G and M were determined in 995 saliva samples. Testing of lung function (whole body plethysmography before and after physical exercise) was performed in children with and without parent-reported wheezing in the last 12 months (n = 377). Response rate (questionnaire: 93%) and participation rates (saliva samples: 86%, lung function tests: 93%) were high. Our study confirmed higher prevalence of asthmatic symptoms in children aged 6-8 in Ochtrup (13.2%) compared to children of the same age in Muenster (8.5% (Duhme et al., Eur. Respir. J. 11, 840-847, 1998)). However, in the age group 12-15 years the prevalence was significantly lower in Ochtrup (9.8%), when compared to the former investigation and in comparison to Muenster (former survey: 17.9%; Muenster: 13.1%). Prevalence of wheezing was consistently higher in families with atopic disease. Additionally, history of respiratory disease, premature birth and presence of pets during 1st year of life showed a positive association with prevalence of wheezing. Mean salivary IgA levels were 61.4 (SD (standard deviation) 35.1, median: 53.7) mg/l in children aged 6-8 years and 83.4 (SD 39.0, median: 76.3) mg/l in children aged 12-15 years. No significant association between salivary immunoglobulins and wheezing was detected.
authors.affiliation: Institut fuer Hygiene, Sozial- und Umweltmedizin, Department for Hygiene, Environmental and Social Medicine, Ruhr-University Bochum, Universitaetsstrasse 150, D-44801 Bochum, Germany. juergen.hoelzer@ruhr-uni-bochum.de
authors.forename: Juergen
authors.initials: J
authors.lastname: Hoelzer
authors.forename: Renate
authors.initials: R
authors.lastname: Stiller-Winkler
authors.forename: Friederike
authors.initials: F
authors.lastname: Lemm
authors.forename: Nicole
authors.initials: N
authors.lastname: Witzke
authors.forename: Ulrich
authors.initials: U
authors.lastname: Ewers
authors.forename: Helga
authors.initials: H
authors.lastname: Idel
authors.forename: Michael
authors.initials: M
authors.lastname: Wilhelm
mesh_terms: D000293:Adolescent; D002648:Child; D016021:Epidemiologic Studies; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis*; D008297:Male; D015995:Prevalence; D012129:Respiratory Function Tests; D012135:Respiratory Sounds / Q000209:etiology*; D012141:Respiratory Tract Infections / Q000150:complications / Q000453:epidemiology*; D012307:Risk Factors; D012424:Rural Population; D012463:Saliva / Q000276:immunology
chemical_list: D007070:Immunoglobulin A