. Author manuscript; available in PMC: 2014 Jul 1.

Published in final edited form as: J Ren Nutr. 2013 Jul 19;23(6):422–427. doi: 10.1053/j.jrn.2013.05.003

Table 1.

Baseline Characteristics by 25-OH Vitamin D Tertiles in the Analytic Cohort (n = 256)

	Lowest Tertile Mean ± SD or Percent (n)	Middle Tertile Mean ± SD or Percent (n)	Highest Tertile Mean ± SD or Percent (n)
Patient characteristics
Age (y)	60.4 ± 13.6	60.4 ± 14.4	65.5 ± 13.4^*
Female	54.1 (46)	54.7 (47)	27.1 (23)^*
Race, non-white	34.1 (29)	31.4 (27)	23.5 (20)
College education or more	51.9 (41)	52.2 (36)	44.3 (31)
Body mass index (kg/m²)	31.3 ± 8.4	31.1 ± 8.6	27.7 ± 5.5^*
Peritoneal dialysis	14.1 (12)	9.3 (8)	3.5 (3)
Hemodialysis access via catheter^†	59.7 (40)	56.5 (35)	35.8 (24)^*
Comorbidities
Diabetes	63.5 (54)	57.0 (49)	56.0 (47)
Atherosclerotic heart disease	41.2 (35)	37.2 (32)	33.3 (28)
Congestive heart failure	41.2 (35)	32.6 (28)	26.2 (22)
Baseline serum laboratory values
Albumin (g/dL)	3.4 ± 0.5	3.4 ± 0.4	3.6 ± 0.4^*
Hemoglobin (g/L)	10.1 ± 1.9	10.3 ± 1.5	10.4 ± 1.6
Creatinine (mg/dL)	6.3 ± 2.9	7.1 ± 4.4	7.4 ± 3.5

25-OH vitamin D, 25-hydroxy vitamin D; SD, standard deviation.

Tertiles represent serum concentrations of 25-OH vitamin D ≤10.6 ng/mL for the lowest and ≤15.5 ng/mL for the middle tertile. The maximum serum concentration in the highest tertile was 41.5 ng/mL.

Significant difference across the tertiles.

^†

Percentages were calculated based on patients on hemodialysis only.