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. Author manuscript; available in PMC: 2022 Oct 20.
Published in final edited form as: Physiol Meas. 2020 Jun 30;41(6):065004. doi: 10.1088/1361-6579/ab8e12

Table 3.

Within- individual factors associated with lung to finger circulation time (LFCT) measures

Beta estimate (in sec) SE P value
Event duration (per 1 sec increase) −0.0621 0.0038 < 0.001
Nadir SpO2
(per 1% higher)		 −0.1025 0.0103 < 0.001
Type of event = apnea (vs. hypopnea) 2.6162 0.0904 <0.001
Sleep position
(supine vs. non-supine)		 0.1143 0.1157 0.32
Sleep stage
(REM vs. NREM)		 1.119 0.1083 < 0.001

Results from multivariable mixed model. For each candidate exposure, the model evaluated its relationship with lung to finger circulation time (LFCT) (the outcome), grouping by subject and with random effects for slope and intercept. Each model was adjusted for age (continuous), race, sex, height, weight and apnea hypopnea index. SpO2, oxygen saturation; REM, rapid eye movement sleep; NREM, Non-REM sleep.