. Author manuscript; available in PMC: 2022 Dec 1.

Published in final edited form as: Sleep Health. 2021 Oct 9;7(6):699–707. doi: 10.1016/j.sleh.2021.08.005

Table 3.

Principal Components Analysis of sleep health metrics: Ru SATED, Ru SATED + OSA and architecture, Sleep Health Score (SHS), SHS-parsimonious

		Ru SATED			Ru SATED + OSA and architecture			SHS-PC1			SHS-PC1 (parsimonious)
		α= 0.42			α= 0.47			α= 0.61			α= 0.45
Percent of Variance		27.72%	20.01%	17.06%	20.40%	15.09%	13.01%	19.55%	13.71%	9.32%	18.39%	14.06%	11.75%
	Also known as	PC1	PC2	PC3	PC1	PC2	PC3	PC1	PC2	PC3	PC1	PC2	PC3
Ru SATED
(Ir)regularity^↓(timing)	MPsd	−0.59	0.26	−0.12	−0.45	−0.45	0.06	−0.31	−0.53	0.11	−0.45	−0.43	0.10
Satisfaction/quality^↓ (increasing insomnia symptoms)	Quality	−0.07	−0.61	−0.45	−0.08	0.22	0.63	−0.07	0.10	0.50	−0.08	0.23	0.60
Alertness^↓ (increasing ESS)	ESS	−0.31	−0.51	−0.31	−0.29	0.10	0.53	−0.18	−0.03	0.37	−0.29	0.10	0.50
Timing^↓ (increasing delay)	Timing	−0.39	0.41	−0.35	−0.26	−0.49	−0.04	−0.14	−0.36	0.00	−0.25	−0.46	0.01
Efficiency^↑ (maintenance)	SME	0.24	0.36	−0.69	0.32	−0.29	0.06	0.41	−0.32	−0.09	0.33	−0.32	0.05
Duration^↗	TST	0.58	0.05	−0.29	0.50	0.21	−0.07	0.33	0.24	−0.03	0.49	0.24	−0.07
PSG (architecture)
Apnea-Hypopnea Index^↓	AHI				−0.38	0.43	−0.23	−0.32	0.18	−0.29	−0.38	0.38	−0.27
% N3^↗	% N3				0.14	−0.34	−0.18	0.14	−0.12	0.08	0.15	−0.31	−0.14
% R^↗	% R				0.35	−0.25	0.48	0.27	−0.05	0.53	0.35	−0.17	0.51
SHS additions
Irregularity^↓ (duration)	TS Tsd							−0.27	−0.42	0.15
Onset latency^↓	SO Lact							−0.11	0.26	0.33	−0.06	0.34	0.12
Fragmentation^↓	FI							−0.44	0.36	0.11
Wake after sleep onset^↓	WASO							−0.32	−0.01	−0.28

Ru SATED: Regularity Satisfaction Alertness Timing Efficiency Duration. SHS: Sleep Health Score. SHS (PC1): Sleep Health Score principal component 1. Ru SATED + OSA and architecture: Regularity Satisfaction Timing Efficiency Duration + obstructive sleep apnea + sleep architecture. ESS: Epworth Sleepiness Scale. % N3: % non-rapid eye movement, stage 3 sleep. % R: % rapid eye movement sleep. PSG: polysomnography.

↑ = Higher is better; ↓ = lower is better; ↗ = generally higher is better, but overexpression can be problematic (eg long sleepers, excessive % R)