Table 4.

Baseline characteristics and polysomnographic characteristics of the CHF patients according to their group.

Variable	CHF children (low output failure group)	CHF children (high output failure group)	Control group 2 (CHF adults)
Total sleep time (min)	280 ± 99	160 ± 55*	272 ± 23
Sleep efficiency (%)	69 ± 4	64 ± 8	72.2 ± 4
Arousal index (no./h)	14 ± 4.5	7 ± 2*	19 ± 2.7
Prevalence of CSA-CSR (%)	0	0	40*
Wake ${\text{ Sa}}_{{\text{O}}_{\text{2}}}$ (%)	96 ± 1	95.5 ± 2.4	93 ± 0.7
Mean ${\text{ Sa}}_{{\text{O}}_{\text{2}}}$ (%)	97 ± 2	91 ± 3.8	89.3 ± 1.7
Mean ${\text{ Sa}}_{{\text{O}}_{\text{2}}}$ nadirs (%)	94 ± 2	92 ± 3	86 ± 4
ETCO2	40 ± 2	38 ± 1	38 ± 4

Data presented as mean ± SEM.

${\text{ Sa}}_{{\text{O}}_{\text{2}}}$, oxygen saturation; CSA-CSR, central sleep apnea-Cheyne–Stokes respiration; ETCO₂, end-tidal CO_2.

*p 0.05 (from other two groups).