Table 4.

Correlation of self-reported EDS (ESS ≥ 10) with severe sleep apnea, nocturnal hypoxemia, and patterns of sleep apnea among the CKD patients, the HD patients, and the Sleep-SCORE controls

CKD Stage 4 to 5 (n = 89)HD (n = 75)Sleep-SCORE Controls (n = 224)
AHI ≥ 30ϕ = 0.13, P = 0.23ϕ = 0.32, P = 0.009bϕ = 0.09, P = 0.19
Nocturnal hypoxemia ≥ 3% TSTϕ = 0.16, P = 0.18ϕ = 0.08, P = 0.54ϕ = 0.13, P = 0.07
Obstructive apnea indexrpb = 0.12, P = 0.29rpb = 0.27, P = 0.02arpb = 0.14, P = 0.03a
Central apnea indexrpb = 0.12, P = 0.27rpb = 0.18, P = 0.13rpb = 0.07, P = 0.28
Mixed apnea indexrpb = 0.06, P = 0.56rpb = 0.25, P = 0.03arpb = 0.09, P = 0.18
  • Results are expressed as correlation coefficient (ϕ) or r point biserial (rpb) and two-tailed statistical significance (P). Nocturnal hypoxemia ≥ 3% TST, percentage ≥3% of total sleep time with oxyhemoglobin saturation <90%.

  • Significance at the a0.05 and b0.01 level.