Table 3. Association between serum phosphorus and all-cause mortality.

	Serum phosphorus range, mg/dl	Number of subjects	Mortality per 1000 person-years	Unadjusted	Model 1	Model 2	Model 3
Quartile 1	≤3.3	2979	19.8	Ref	Ref	Ref	Ref
Quartile 2	>3.3 to 3.7	2947	23.2	1.18 (0.94–1.47)	1.12 (0.88–1.43)	1.20 (0.94–1.54)	1.22 (0.95–1.56)
Quartile 3	>3.7 to 4.1	2577	20.3	1.01 (0.80–1.29)	0.96 (0.75–1.25)	1.01 (0.78–1.32)	1.00 (0.76–1.32)
Quartile 4	>4.1	2169	22.7	1.12 (0.88–1.42)	1.01 (0.77–1.33)	1.02 (0.77–1.36)	1.00 (0.75–1.33)

Model 1: adjusted for demographics (age, gender, race/ethnicity, highest education), year of screening, cardiovascular risk factors (diabetes, hypertension, dyslipidemia, current tobacco use, body mass index), and severity of chronic kidney disease (CKD; estimated glomerular filtration rate (eGFR) and albuminuria).

Model 2: adjusted model 1 plus laboratory parameters (plasma glucose, calcium, parathyroid hormone, and hemoglobin).

Model 3: adjusted model 2 plus CKD awareness and health insurance.