Table 5.

Cox proportional hazard model statistics for ESS and regional brain OLE (HR _O) in post‐COVID patients.

	Z‐score	95% CI	Hazard ratio	p‐value
Age	2.985	1.145–1.922	1.484	2.84e‐3*
Sex	2.034	1.164–3.548e3	64.27	0.042*
Brainstem	−2.671	0.011–0.499	0.074	7.56e‐3*
Deep grey matter	2.272	1.813–3.226e3	76.48	0.023*
Amygdala	1.724	0.968–1.652	1.265	0.085
Nucleus accumbens	−2.621	0.570–0.922	0.725	8.77e‐3*
Hippocampus	−0.795	0.520–1.319	0.828	0.427
Thalamus	−1.599	0.307–1.127	0.588	0.110
Globus pallidus	1.050	0.772–2.355	1.348	0.294
Putamen	−2.518	0.210–0.823	0.416	0.012*
Caudate nucleus	−0.577	0.631–1.285	0.901	0.563
Total white matter	1.440	0.902–1.960	1.330	0.150
Cortical grey matter	−2.855	0.167–0.717	0.346	4.30e‐3*

Note that p‐values are not adjusted for multiple comparisons for false discovery rate in this table. Bolded text indicates statistically significant associations (*p < 0.05).

CI, confidence interval; ESS, Epworth Sleepiness Scale; HR _O, hazard ratio calculated from Cox proportional hazard models using only OLE metrics; OLE, oxygen level estimate.