title: Statistical investigations into the measured DALA--discharge in the urine of infants.
abstract: Using a sample of the size 353 on day-nursery children, the authors show that the DALA-U increase, which is due to the absorption of lead and other substances, does not display any age or sex dependence. A dependence upon the day nursery's location is assumed. The authors elaborate on the statistical problems (normal distribution) and the boundary value problems associated with the various DALA-U values measured. Large sample sizes are required to find a final clarification of the relationships.
mesh_terms: D000367:Age Factors; D000622:Aminolevulinic Acid / Q000652:urine*; D002656:Child Day Care Centers; D002675:Child, Preschool; D003404:Creatinine / Q000652:urine; D004785:Environmental Pollutants / Q000032:analysis*; D005260:Female; D006801:Humans; D007854:Lead / Q000032:analysis*; D007982:Levulinic Acids / Q000652:urine*; D008297:Male; D012737:Sex Factors; D013046:Specific Gravity; D013223:Statistics as Topic
chemical_list: D004785:Environmental Pollutants; D007982:Levulinic Acids; D007854:Lead; D000622:Aminolevulinic Acid; D003404:Creatinine