Background & Objectives: Urinary stone disease is one of the common urinary tract complications that can lead to renal failure. It occurs usually in middle-aged and older men The aim of this study was to determine the association between types of urinary stones and risk factors for urinary stone formation in patients referred to Ardabil therapeutic centers.

  Methods : In this descriptive cross-sectional study, 150 patients with urinary stone were followed from March 2008 to July 2009 in therapeutic centers of Ardabil.

  Data were collected by a questionnaire include demographic factors such as age, gender, body mass index (BMI), Job and Habitation place. Data were analyzed by chi-square test and ANOVA in SPSS 16 software. The level of significance was p<0.05.

  Results: 116 of patients (77.3%) had calcium oxalate stone, 15 of patients (10%) had phosphate calcium stone, 10 of patients (6.7%) had acid uric and 9 of patients (6%) had phosphate ammonium stone. The mean age of patients was 41.90 + 14.41 years (48% of patients were 30-50 years old) and the mean body mass index (BMI) was 25.81+3.66. 91 of patients (60.66%) were male and 59 (39.4%) of them were female. There was no significant difference between types of urinary stones and factors including BMI the job of patient, (p=0.252), habitation place (p=0.173), history of previous illness (p=0.207) and history of drug use (p=0.247).

  Conclusion: The most common type of urinary stones was calcium oxalate (77.3%) in both men and women however ammonium phosphate (6%) is much less common.