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. 2021 Feb 3;9(2):e24704. doi: 10.2196/24704

Table 1.

Characteristics of the sample (N=20).

Characteristic			Value
Age (years), mean (SD)			24.50 (3.50)
Sex (female), n (%)			10 (50)
BMI (kg/m²), mean (SD)			23.64 (3.10)
PSQI^a score, mean (SD)			5.40 (2.35)
Poor sleep quality (PSQI score>5), n (%)			5 (25)
Polysomnography-measured sleep, mean (SD)
	Sleep onset (hour:minute)		23:44 (1:05)
	TST^b (hour:minute)		7:28 (0:49)
	Sleep efficiency (%)		91.55 (5.82)
	N1^c of TST (%)		4.68 (2.71)
	N2^d of TST (%)		47.46 (6.14)
	N3^e of TST (%)		22.18 (7.11)
	REM^f of TST (%)		25.68 (5.48)

^aPSQI: Pittsburgh Sleep Quality Index.

^bTST: total sleep time.

^cN1: sleep stage 1 (light sleep).

^dN2: sleep stage 2 (light sleep).

^eN3: sleep stage 3 (slow wave sleep).

^fREM: rapid eye movement.