Relative and absolute frequencies of serum creatinine levels greater than the upper limit of the normal laboratory range

Relative and absolute frequencies of serum creatinine levels greater than the upper limit of the normal laboratory range (men >1.2 mg/dL; women >0.9 mg/dL) in residents aged 20 to 60 years of two coastal villages by categories of duration of work on coastal sugarcane or cotton plantations.