Table 1.

Characteristics of patients and community controls

CharacteristicCKD Stages 4 to 5 (n = 89)HD (n = 75)Sleep-SCORE Controls (n = 224)P
Age (years)51 (42.5, 64)57.5 (46, 67.2)59.8 (54.5, 65.2)<0.001
Controls > CKD,a HD > CKDc
Male60 (67.4%)49 (66.2%)113 (50.4%)0.006
CKD > controls,b HD > controlsc
White70 (78.7%)45 (60.8%)127 (56.7%)0.001
CKD > controls,a CKD > HDb
High school education82 (92.1%)63 (85.1%)221 (98.7%)0.001
Controls > CKD,b controls > HDa
Employed40 (44.9%)11 (14.9%)136 (60.7%)<0.001
Controls > CKD,b controls > HD,a CKD > HDa
BMI (kg/m2)27.6 (25, 31.2)27.2 (23.5, 31.2)28.6 (25.8, 32.7)0.01
Controls > CKD,b controls > HDb
Neck circumference (cm)38 (36, 41.5)40 (37.2, 43.7)38.6 (36.7, 42.7)0.06
SBP (mmHg)148.2 (132.1, 165.5)145.7 (126.6, 169.4)131 (122.5, 141.5)<0.001
CKD, HD > controlsa
DBP (mmHg)83.7 (73.4, 90.9)78.5 (70.0, 88.9)79.7 (73.5, 86.5)0.040
CKD > controls,b CKD > HDb
Glucose (mg/dl)93.7 (85, 121)119 (96.5, 147.2)95 (86, 103)<0.001
HD > controls,a HD > CKDa
Total number of antihypertensives3 (2, 4)2 (1, 3)0 (0, 1)<0.001
CKD, HD > controls,a CKD > HDb
Antidepressants13 (14.6%)10 (13.7%)18 (8%)0.15
Smoking0.7
    current13 (14.6%)8 (10.8%)19 (8.5%)
    former28 (31.5%)33 (44.6%)106 (47.3%)
    never48 (53.9%)33 (44.6%)99 (44.2%)
  • Results are presented as medians and interquartile ranges or as percentages. Numbers in parentheses reflect the 25th and the 75th percentile of the variables.

  • a P < 0.001;

  • b P < 0.01;

  • c P < 0.05 for the pairwise comparisons.