Table 1.

Patient characteristics associated with limited health literacy

CharacteristicaAll Patients (n = 480)Limited Health Literacy (<9th Grade) (n = 154)Adequate Health Literacy (≥9th Grade) (n = 326)PAdjusted Pb
Age (years)62.0 [51.0, 72.0]64.0 [50.2, 72.0]60.0 [51.2, 71.8]0.9470.742
Male269 (56%)90 (58%)179 (55%)0.4010.001
White (n = 433)224 (52%)42 (30%)182 (63%)<0.001<0.001
Education (years) (n = 461)12.0 [11.0, 13.0]11.0 [8.0, 12.0]12.0 [12.0, 14.0]<0.001<0.001
Married219 (46%)57 (37%)162 (50%)0.0010.022
REALM [0 to 66]64.0 [56.0, 66.0]
    <9th grade reading level154 (32%)
Diabetes mellitus239 (50%)69 (45%)170 (52%)0.1130.436
Body mass index (kg/m2) (n = 379)27.4 [23.5, 33.2]26.8 [23.3, 33.2]27.6 [23.7, 33.2]0.1810.546
Dry weight (kg)79.0 [65.5, 93.6]76.8 [64.0, 92.0]79.8 [68.0, 94.0]0.021
Kt/V (n = 447)1.4 [1.2, 1.6]1.4 [1.2, 1.6]1.4 [1.2, 1.6]0.8380.724
Albumin (g/dl) (n = 479)3.6 [3.1, 3.9]3.5 [3.0, 3.9]3.6 [3.2, 3.9]0.0120.066
Transferrin saturation (%) (n = 477)17.0 [14.0, 23.0]17.0 [14.0, 22.0]17.0 [13.0, 23.0]0.712
Hemoglobin (g/dl)10.7 [9.6, 11.9]10.8 [9.8, 12.0]10.7 [9.5, 11.8]0.510
Phosphorus (mg/dl)5.1 [4.1, 6.3]5.1 [4.0, 6.5]5.0 [4.2, 6.3]0.725
Calcium (mg/dl) (n = 479)8.7 [8.2, 9.2]8.8 [8.1, 9.2]8.7 [8.2, 9.2]0.274
Calcium/phosphorus product45.0 [36.5, 55.3]45.6 [36.1, 55.8]45.0 [36.9, 55.2]0.531
Intact-parathyroid hormone (pg/ml) (n = 470)217 [121, 406]217 [124, 388]217 [121, 418]0.455
Access (n = 473)
    catheter367 (78%)115 (75%)252 (79%)0.220
    arteriovenous fistula or graft106 (22%)38 (25%)68 (21%)
  • aMedian [IQR] or n (%).

  • bAdjusted for age, gender, race, education, marital status, diabetes mellitus status, body mass index, Kt/V, and serum albumin.