Fig. 2
Restricted cubic spline for the serum calcium to diarrhea risk ratio. Adjusted for age, gender, race, education, marital status, family income, smoking stuts, drinking, high intensity exercise, moderate intensity activity, albumin, serum iron, cholesterol, phosphorus, total protein, uric acid, serum vitamin D, sodium, potassium, calcium intake, diabetes, arthritis, kidney failure, osteoporosis, thyroid disease