Table 1.

Demographic and medical characteristics of the study populationa

VariableEntire Group(n = 154)Cases(n = 35)Noncases(n = 119)Pb
Age (yr; average)54.6 (13.3)62.3 (12.1)52.2 (12.7)<0.0001
Male gender (%)5556.348.60.42
Race (%)
    black58.258.557.10.89
    white13.716.15.70.12
    Hispanic26.823.737.10.12
    other1.31.700.44
Average duration of HD (yr)4.0 (3.2)4.0 (3.3)3.9 (3.2)0.90
Cause of ESKD (%)
    hypertension12.311.412.60.85
    diabetes22.121.025.70.55
    glomerulonephritis7.12.68.90.26
    otherc58.455.357.70.83
Center
    North Carolina53944
    New York City10126750.22
No. of teeth20.314.1 (8.7)22.2 (7.3)<0.0001
BMI (kg/m2)28.4 (7.5)27.2 (6.6)28.8 (7.7)0.23
Current smokers (%)25.334.322.70.17
Serum total cholesterol (mg/dl)154.9 (42.2)150.5 (36.6)156.3 (43.8)0.44
Serum calcium (mg/dl)9.3 (0.8)9.1 (0.8)9.3 (0.9)0.29
Serum phosphorus (mg/dl)5.8 (1.6)5.6 (1.9)5.9 (1.6)0.44
nPCR (g/d)1.00 (0.27)0.98 (0.26)1.09 (0.26)0.04
  • a Data are means (SD) for continuous variables and frequency for categorical variables. Cases refer to individuals with periodontal disease (≥60% of sites with attachment level ≥4 mm), and noncases refer to individuals without severe periodontal disease. BMI, body mass index; ESKD, end-stage kidney disease; HD, hemodialysis; nPCR, normalized protein catabolic rate.

  • b For the difference between cases and noncases.

  • c Includes HIV-related disease, polycystic kidney disease, tumors, poisonings, and unknown.