Table 2.

Odds ratio (95% confidence intervals) of low serum phosphorus levels (<3.5 mg/dl) stratified by age category

Age Range (years)	15-<45	45-<65	65-<70	70-<75	≥75
Unadjusted	Reference	1.67 (1.44-1.94)	2.93 (2.48-3.45)	3.93 (3.35-4.61)	5.43 (4.7-6.28)
Case-mix	Reference	1.94 (1.66-2.27)	3.6 (3.02-4.29)	4.94 (4.16-5.87)	6.93 (5.89-8.15)
Case-mix and MICS	Reference	1.14 (0.97-1.35)†	1.62 (1.34-1.96)	1.96 (1.63-2.36)	2.32 (1.95-2.77)

Note: P-values<0.001 except p-value

^†0.11; 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, calcium, intact parathyroid hormone, bicarbonate, hemoglobin, blood white blood cells, lymphocyte percentage and normalized protein nitrogen appearance.

Abbreviations: MICS, malnutrition-inflammation complex syndrome.