. 2023 Dec 21;11(2):302–320. doi: 10.1002/acn3.51952

Table 6.

Multiple linear regression models testing the association between cognitive variables and level of functioning.

WHODAS Mobility (controlled for sex, income, change in employment status, and post‐COVID symptoms)
F	p	R ² _adj (%)
44.726	0.0001	38.2%	Predictors	Beta	t	p	Tolerance	VIF
			Constant		0.414	0.679
			PHQ‐9 score	0.232	3.774	0.0001	0.463	2.161
			Post‐COVID symptoms	0.181	3.331	0.0001	0.595	1.681
			CFQ score	0.199	3.087	0.002	0.421	2.378
			Digit symbol score	−0.113	−2.553	0.011	0.894	1.118
			Change in employment status	0.109	2.323	0.021	0.795	1.258

WHODAS self‐care (controlled for sex, income, change in employment status, and post‐COVID symptoms)
F	p	R ² _adj (%)
25.219	0.0001	17%	Predictors	Beta	t	p	Tolerance	VIF
			Constant		−0.169	0.866
			CFQ score	0.232	−3.867	0.0001	0.649	1.542
			Digit symbol score	−0.180	−3.578	0.0001	0.928	1.078
			Post‐COVID symptoms	0.145	2.375	0.018	0.626	1.598

WHODAS getting along (controlled for sex, income, change in employment status, and time since onset to assessment)
F	p	R ² _adj (%)
55.702	0.0001	23.7	Predictors	Beta	t	p	Tolerance	VIF
			Constant
			PHQ‐9 score	0.451	9.255	0.0001	0.912	1.096
			SCWT W score	−0.103	−2.109	0.036	0.912	1.096

WHODAS life activities (controlled for sex, income, change in employment status, time since onset to assessment, severity of COVID‐19, and post‐COVID symptoms)
F	p	R ² _adj (%)
67.236	0.0001	48.3%	Predictors	Beta	t	p	Tolerance	VIF
			Constant		−0.127	0.899
			PHQ‐9 score	0.284	4.992	0.0001	0.453	2.210
			CFQ score	0.258	4.381	0.0001	0.420	2.381
			Post‐COVID symptoms	0.195	3.961	0.0001	0.601	1.664
			Sex (female)	0.099	2.461	0.014	0.900	1.111
			Digit span forward	−0.091	−2.259	0.024	0.909	1.100

WHODAS participation (controlled for age, sex, income, change in employment status, time since onset to assessment, severity of COVID‐19, and post‐COVID symptoms)
F	p	R ² _adj (%)
77.200	0.0001	60.2%	Predictors	Beta	t	p	Tolerance	VIF
			Constant		−1.100	0.272
			PHQ‐9 score	0.403	8.052	0.0001	0.451	2.218
			CFQ score	0.223	4.299	0.0001	0.419	2.387
			Change employment status	0.149	3.939	0.0001	0.788	1.269
			Post‐COVID symptoms	0.112	2.571	0.011	0.596	1.679
			Education	0.117	3.233	0.001	0.861	1.161
			Digit symbol score	−0.088	−2.097	0.037	0.635	1.576

CFQ, Chalder Fatigue Questionnaire; CW, color word; PHQ‐9, Patient Health Questionnaire‐9; SCWT, Stroop color word test; W, word; WHODAS, World Health Organization Disability Assessment Schedule‐II.