Personal Characteristics and Urinary Stones

BackgroundUrinary stone disease is a common, painful and costly condition that has affected humankind since antiquity, and there is evidence to show that its incidence has continually increased during past decades. Studies have shown that many extrinsic and intrinsic factors are related to this disease in different population groups. The aim of this study was to identify the personal characteristics that are associated with urinary stone formation.MethodsAll subjects were recruited in the same 7-month period: there were 161 patients with idiopathic renal stone disease and 254 age- and gender-matched healthy subjects. Each participant was individually interviewed with regard to their sociodemographic characteristics and family medical history.ResultsOf patients with renal stones, 66.5% were male; the male to female ratio was 1.98 to 1. The prevalence of renal stone was highest in men aged 30–50 years and in women aged 40–60 years. The main differences between stone formers and healthy subjects were that stone formers had higher body mass index (p = 0.007), lower educational (p = 0.001) and economic (p = 0.037) levels, and more positive family history of urinary stones (p < 0.0001), especially in their siblings. The percentage of unemployed subjects and housekeepers were higher in the case group. The type and duration of employment were significantly different in the two groups (p = 0.014 for type and p = 0.003 for duration). With regard to the job environment (i.e. workplace), most of the individuals in the case group worked outdoors (p = 0.025) and in warm places (p < 0.0001).ConclusionThere are many personal characteristics that might be associated with an elevated risk of renal stone formation. People with high-risk characteristics could be more prone to stone formation and should be more carefully evaluated and followed-up.