Urolithiasis in general practice. An epidemiological study from a Norwegian district.Scand J Urol Nephrol 1983; 17(3):313-9SJ
The incidence of urolithiasis associated with a stone colic has been investigated in general practice in a rural, partly industrialized area of Eastern Norway. Two cases per year per 1000 inhabitants were observed. The incidence showed seasonal variation, with a maximum during the winter and autumn months in four consecutive years. As reported by others, there was an excess of male patients (2.7:1) and of persons with sedentary occupations. A peak stone incidence was found in the middle-aged groups (30-60 years). The probably unselected patient group from the incidence registration was compared with a selected material of patients referred for recurrent stone disease. The unselected patients from general practice showed about 1/5 the median number of stone episodes and 1/4 the median duration of the disease.