once the kimberleypilbara region and outlier was excluded the variation fell to fold some explanations for this may include higher rates of osteoporosis and obesity in the region and that aboriginal and torres strait islander australians are more likely than others to fracture their hip acsqhc and aihw there was over a fold difference between the highest rate admissions per in outer regional murrumbidgee and the lowest rate admissions per population in metropolitan inner west sydney however the authors noted that murrumbidgee was an outlier in the results removal reduced the difference to fold