title: [Prevalence and composition of urolithiasis in a pediatric Tunisian population].
abstract: OBJECTIVE
  The epidemiologic characteristics are significant to take into account in order to determine the etiology of the paediatric urinary calculi. In this study we studied the composition of stones according to the sex and the age.
  
  
  METHODS
  Our study focuses on 205 tunisian children aged between three months and 16 years, admitted in our service between 1993-2007. A first urinary metabolic balance was conducted among 126 patients. The physical and chemical stones analysis was performed respectively by a stereomicroscope and infrared spectroscopy. Statistical analysis of the results was made using the software SPSS11.0.
  
  
  RESULTS
  Bladder stone was present in 30.7%. It was more frequent in infants than children over 10 years (p<0.02). The Whewellite was present in 72.7% and predominant in older children stones (59.3% vs 42.9% in infants) (p<0.05). Purines stones were more common among infants. Struvite has been the major compound in only 7.8% of cases where it was more common in infants (p<0.05) male (p<0001).
  
  
  CONCLUSIONS
  The higher prevalence of calcium oxalate stones and weaker purin ones in old children suggested the presence of different lithogenous factors of risk according to the age. A modification of the food practices is probably in question.
authors.affiliation: Laboratoire de biochimie-toxicologie, CHU de Monastir, rue 1(er)-Juin, 5000 Monastir, Tunisie. akram_alaya@yahoo.co.uk
authors.forename: A
authors.initials: A
authors.lastname: Alaya
authors.forename: A
authors.initials: A
authors.lastname: Nouri
authors.forename: M F
authors.initials: MF
authors.lastname: Najjar
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002129:Calcium Oxalate / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D017616:Magnesium Compounds / Q000032:analysis; D008297:Male; D010710:Phosphates / Q000032:analysis; D015995:Prevalence; D011687:Purines / Q000032:analysis; D000069877:Struvite; D014416:Tunisia / Q000453:epidemiology; D001744:Urinary Bladder Calculi / Q000737:chemistry; D052878:Urolithiasis / Q000453:epidemiology*
chemical_list: D017616:Magnesium Compounds; D010710:Phosphates; D011687:Purines; D002129:Calcium Oxalate; D000069877:Struvite; C030985:purine