Table 1.

Patient characteristics according to the extent to which patients were bothered by itchy skin

VariableTo What Extent Were You Bothered by Itchy Skin during the Past 4 wk?
No ResponseNot at AllSomewhatModeratelyVery MuchExtremely
Total sample, N2365211118401188692425
Total sample, %2720171164
Patient characteristics
 Men606059606059
 Age, yr66 (15)62 (15)62 (15)63 (15)63 (15)64 (15)
 Time on dialysis, yr5.1 (5.6)5.4 (6.2)5.8 (6.2)5.3 (5.7)4.9 (5.4)5.1 (6)
 BMI, kg/m226 (6)26 (6)25 (6)26 (7)26 (6)26 (7)
 Treatment time, min231 (37)237 (34)237 (35)235 (32)232 (32)232 (29)
 Hemodiafiltration,a %222016171617
 Smokerb221921222421
 Hepatitis B/C568999
Laboratory values
 Hemoglobin, g/dl10.9 (1.4)11 (1.4)11 (1.4)11 (1.4)11 (1.4)10.9 (1.5)
 Parathyroid hormone, pg/ml355 (379)355 (416)348 (449)346 (496)322 (345)349 (430)
 White blood cell count6.9 (2.3)6.7 (2.1)6.7 (2.2)6.7 (2.2)6.8 (2.4)7 (2.5)
 Albumin, g/dl3.7 (0.5)3.8 (0.5)3.7 (0.5)3.7 (0.5)3.7 (0.5)3.7 (0.5)
 Ferritin, ng/ml486 [228–806]410 [159–754]344 [105–672]394 [156–715]382 [155–680]401 [141–704]
 Calcium, mg/dl8.9 (0.8)8.9 (0.8)8.9 (0.8)8.9 (0.8)8.9 (0.8)8.9 (0.8)
 Phosphorus, mg/dl4.9 [4–5.9]4.9 [4.1–5.9]5.1 [4.2–6.0]5 [4–5.9]5 [4.1–6]5 [4.1–6.1]
 Calcium × phosphorus product, mg2/dl243 (35, 53)43 (36, 52)45 (36, 55)44 (35, 52)44 (36, 53)44 (36, 54)
 Single-pool Kt/V1.5 (0.3)1.5 (0.3)1.5 (0.3)1.5 (0.3)1.5 (0.3)1.5 (0.3)
 CRP, mg/Lc4.7 [1.5–13.2]3 [1–8]2.7 [1–7]4 [1–9.7]4 [1–10.5]5.3 [1.7–15.8]
Patient-reported measures, %
 Bothered by dry skind1421688187
 Have restless sleepe2936465766
  • Data are from patients enrolled at the start of the Dialysis Outcomes and Practice Patterns Study phase 5 (i.e., 2012–2015). Data are shown as mean (SD), median [interquartile range], or column percentage. Nonresponse rate was 27% overall, varying from 9% in Turkey to 46% in Canada. BMI, body mass index; CRP, C-reactive protein.

  • a Hemodiafiltration excludes the United States and Canada due to lack of use (n=6024).

  • b Smoker is defined as someone indicating being a current smoker or who stopped smoking within past year; this measure was missing for all patients from United States large dialysis organizations (n=5871).

  • c CRP is restricted to facilities that reported measurement in at least 50% of patients (excludes the United States; n=2607).

  • d Measure shows the percentage of patients who selected moderately, very much, or extremely bothered (versus not at all or somewhat) in response to the question on the Patient Questionnaire: “During the past 4 weeks, to what extent were you bothered by each of the following: dry skin?” (n=6152); this measure was missing for most “no response” patients, because they did not return the questionnaire.

  • e Measure shows the percentage of patients who selected “3= Occasionally or a moderate amount of the time (3–4 days)” or “4= Most or all of the time (5–7 days)” versus “1= Rarely or none of the time (<1 day)” or “2= Some or little of the time (1–2 days)” in response to the question on the Patient Questionnaire: “During the past 4 weeks, my sleep was restless” (n=6025); this measure was missing for most “no response” patients, because they did not return the questionnaire.