Table 3.

Odds ratio (95% confidence intervals) of high serum phosphorus levels (≥5.5 mg/dl) stratified by age category

Age Range (years)	15-<45	45-<65	65-<70	70-<75	≥75
Unadjusted	Reference	0.48 (0.46-0.49)	0.27 (0.25-0.28)	0.21 (0.2-0.22)	0.14 (0.13-0.15)
Case-mix	Reference	0.49 (0.47-0.51)	0.28 (0.27-0.3)	0.23 (0.21-0.24)	0.15 (0.14-0.16)
Case-mix and MICS	Reference	0.74 (0.71-0.77)	0.54 (0.51-0.57)	0.48 (0.45-0.51)	0.37 (0.35-0.39)

Note: All P-values<0.001; case-mix model was adjusted for gender, race/ethnicity, presence of diabetes mellitus, baseline comorbidities, history of tobacco smoking, dialysis vintage categories, primary insurance, marital status, types of vascular access, dialysis dose as indicated by single pool Kt/V and residual renal function; case-mix and MICS model was adjusted for all of the covariates in the case-mix model as well as body mass index, serum levels of albumin, total-iron binding capacity, ferritin, creatinine, bicarbonate, calcium, intact parathyroid hormone, hemoglobin, blood white blood cells, lymphocyte percentage and normalized protein nitrogen appearance.

Abbreviations: MICS, malnutrition-inflammation complex syndrome.