Distribution of 24-hour urinary creatinine excretion by sex. A) Whole SSS population and B) Population >60 years old. Vertical lines represent the reference interval according to the current reference values of 177 to 221 μmol/kg/24 hours in men and 133 to 177 μmol/kg/24 hours in women. To convert creatinine from μmol to mg, divide by 8.84. SSS: Swiss Survey on Salt.