Cognitive Impairment and Fatigue in Intensive Care Patients Three Months after the Acute Phase of COVID-19 Infection: Follow-Up with Focus on Differences between the First and Later Waves of the Pandemic

Table 4

Multiple linear regression investigating the relationship of MFI-20 general fatigue (dependent variable) with intubation, Hospital Anxiety and Depression Scale (HADS) depression, and Insomnia Severity Index (ISI).

MFI general fatigue	Unstand. coeff.		Stand. coeff.	Sig.	95% confidence interval for		Collinearity statistics
Independent variables		SE			Lower bound	Upper bound	Tolerance	VIF
(Constant)	12.244	0.985	—	<0.001	10.271	14.218	—	—
Intubation	-2.299	0.922	-0.260	0.016	-4.147	-0.451	1.000	1.000
HADS depression	0.334	0.125	0.313	0.010	0.084	0.584	0.795	1.258
ISI total	0.202	0.068	0.350	0.004	0.067	0.338	0.795	1.258

adjusted, 0.390; change, 0.390; Sig change, <0.001.