Table I Patient demographics
Stone formersControls
Number:
    Total5757
    Male3851
    Female196
Mean age54.952
Stone burden:
    Single stone24
    Multiple stones33
Non-malignant urological problem:
    Simple penile/scrotal surgery29
    TURPa/optical urethrotomy/urethral dilatation18
    Other10
  • a TURP, transurethral resection of prostate.