Manual Characterization of Sleep Spindle Index in Patients with Narcolepsy and Idiopathic Hypersomnia

Table 2

(a) PSG data from narcoleptics and idiopathic hypersomniacs. (b) Intragroup comparison of sleep spindle index in 1st epochs of N2 sleep to last 50 epochs of N2 sleep.

(a)

PSG variable	8 patients with narcolepsy; Mean ± SD	8 patients with idiopathic hypersomnia; Mean ± SD	Mann-Whitney 𝑃 values
Total sleep time	419.56±47.96	461.31±33.35	0.036
Wake after sleep onset	37.94±23.41	32.5±31.91	0.372
Sleep efficiency	90.89±5.08	92.49±5.99	0.674
N1 %	3.36±3.41	3.06±1.9	0.793
N2 %	55.5±14	61.2±10.65	0.345
N3 %	16.38±12.5	17.83±4.04	0.294
REM sleep %	24.76±6.43	17.91±8	0.027*
Sleep spindle index: 1st 50 epochs of N2	0.37±0.73	2.31±2.23	0.001*
Sleep spindle index: last 50 epochs of N2	0.65±1.09	2.84±2.43	0.001*
Sleep spindle index: 100 epochs of N2	0.51±0.93	2.57±2.35	0.001*

PSG: polysomnogram; REM: rapid eye movement sleep; SD: standard deviation. ^∗𝑃 value less than 0.05.

(b)

Comparison	Mann-Whitney; 𝑃 values
N: 1st 50 epochs; N: last 50 epochs	0.006
IH: 1st 50 epochs; IH: last 50 epochs	0.001

N: narcolepsy group; IH: idiopathic hypersomnia group.