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 ≥ 30	ϕ = 0.13, P = 0.23	ϕ = 0.32, P = 0.009b	ϕ = 0.09, P = 0.19
Nocturnal hypoxemia ≥ 3% TST	ϕ = 0.16, P = 0.18	ϕ = 0.08, P = 0.54	ϕ = 0.13, P = 0.07
Obstructive apnea index	rpb = 0.12, P = 0.29	rpb = 0.27, P = 0.02a	rpb = 0.14, P = 0.03a
Central apnea index	rpb = 0.12, P = 0.27	rpb = 0.18, P = 0.13	rpb = 0.07, P = 0.28
Mixed apnea index	rpb = 0.06, P = 0.56	rpb = 0.25, P = 0.03a	rpb = 0.09, P = 0.18

Results are expressed as correlation coefficient (ϕ) or r point biserial (r_pb) 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.