Table 1.

Summary and comparison of baseline demographics, ESRD cause, comorbidities, laboratory parameters, dialysis history, and access type between in-center and satellite-based study participants

ParameterTotal(n = 202)In-center(n = 101)Satellites(n = 101)P (In-centre versus Satellite)
Age (yr; mean ± SD)67.3 ± 13.968.4 ± 12.966.2 ± 14.90.276a
Male gender (%)51.044.657.40.067b
Cause of ESRD (%)0.177c
    diabetes40.638.742.1
    renal vascular disease20.017.322.1
    glomerulonephritis6.58.05.3
    polycystic kidney disease4.79.31.1
    other28.226.729.5
    uncertain/missing32.026.06.0
Comorbidities present (%)
    coronary artery disease45.047.442.60.493b
    cerebrovascular disease28.832.025.70.334b
    diabetes35.934.037.60.597b
    respiratory22.722.722.80.988b
    gastrointestinal21.223.718.80.399b
    musculoskeletal16.718.614.90.484b
    visual impairment30.332.028.70.619b
    behavioral/psychosocial5.16.24.00.475b
    cancer14.914.714.90.982b
Nutrition indicators (mean± SD)
    albumin (g/L)34.9 ± 4.534.7 ± 4.835.1 ± 4.20.561a
    Normalized protein nitrogen appearance (g/kg per d)1.07 ± 0.261.09 ± 0.281.05 ± 0.250.348a
Anemia management (mean± SD)
    Hb (g/L)113.0 ± 15.6112.9 ± 17.3113.1 ± 13.90.988d
    ferritin (μg/L)391.1 ± 344.2352.9 ± 353.0427.8 ± 333.00.126a
    transferrin saturation (%)23.1 ± 15.624.9 ± 12.721.2 ± 18.20.035d
Dialysis adequacy (mean± SD)
    Kt/V1.77 ± 0.441.87 ± 0.521.68 ± 0.340.018d
    Percent reduction in blood urea concentration72.9 ± 9.473.9 ± 6.872.1 ± 11.20.360d
Dialysis history
    Time on dialysis (mo; mean± SD)29.8 ± 34.826.5 ± 34.533.0 ± 34.90.193a
    Time at unit (mo; mean± SD)21.3 ± 28.022.9 ± 30.119.8 ± 26.00.438a
    Time on dialysis (min; mean± SD)229.1 ± 31.1225.1 ± 34.5233.0 ± 27.00.379d
Access type (%)e0.028b
    fistula44.035.452.5
    graft15.013.116.8
    permanent catheter39.549.529.7
    temporary line1.52.033.3
  • a Unpaired t test.

  • b χ2 test for comparing proportions.

  • c Fisher exact two-tailed test.

  • d Wilcoxon two-sample test (performed when variances were not equal).

  • e Counts do not add up to 202 because of missing data.