Investigations based upon these approaches have consistently shown an excess risk of hip OA among farmers. A survey of the radiographs of Swedish farmers who had undergone X-ray of the urinary tract or colon found a prevalence of OA 10 times higher than in control films from the general population. A similar study in Britain identified case from intravenous urogram and found a doubled risk of severe OA in men who had farmed for > 10 years when compared with controls.