. 2021 May 1;203(9):1173–1182. doi: 10.1164/rccm.202005-1808OC

Table 3.

Estimated Differences in Hypopnea and Apnea Duration (in Seconds) per SD Change in Physiologic Traits

Characteristic	NREM Hypopnea Duration			NREM Obstructive Apnea Duration
	Model 1	Model 2	Model 3	Model 1	Model 2	Model 3
	β (SE)	β (SE)	β (SE)	β (SE)	β (SE)	β (SE)
Loop gain (sensitivity)	−1.04 (0.13)^*	−0.80 (0.12)^*	−0.27 (0.11)^†	−0.61 (0.21)^*	−0.38 (0.19)^†	−0.36 (0.20)
Arousal threshold (%eupnea)	1.97 (0.14)^*	1.48 (0.13)^*	1.39 (0.15)^*	2.37 (0.22)^*	1.91 (0.21)^*	1.92 (0.25)^*
Circulatory delay, s	2.81 (0.13)^*	2.17 (0.13)^*	2.53 (0.13)^*	3.04 (0.21)^*	2.28 (0.22)^*	3.10 (0.21)^*
Collapsibility per Vpassive^‡ (%eupnea)	−1.89 (0.16)	−1.43 (0.14)^*	−0.71 (0.16)^*	−2.16 (0.23)^*	−1.72 (0.22)^*	−0.95 (0.25)^*

Definition of abbreviation: NREM = non-REM.

Model 1: unadjusted. Model 2: adjusted for age, sex, BMI, race, and smoking status. Model 3: adjusted for other three physiologic traits.

P < 0.01.

^{^†}

P < 0.05.

^{^‡}

Higher Vpassive indicates less-severe collapsibility; thus, longer events are associated with more severe collapsibility.