Table 1.

Participant characteristics. [SD=standard deviation; COPD=chronic obstructive pulmonary disease.]

Characteristics	Analysis of RTW rate a			Analysis of predictors of time to RTW b			Analysis of extended set of predictors of time to RTW c
	N	%	Mean (SD)	N	%	Mean (SD)	N	%	Mean (SD)
Total	30 396	100		30 171	100		8502	100
Age (years)			40.4 (12.0)			40.4 (12.0)			42.9 (11.9)
Sex
Male	15 352	50.5		15 215	50.4		4071	47.9
Female	15 029	49.5		14 956	49.6		4431	52.1
Prefer not to say	15	0.0
Disease burden (1–10)			6.2 (2.4)			6.2 (2.4)			6.9 (2.1)
Risk group
No	24 301	79.9		24 229	80.3		6394	75.2
Perhaps/somewhat	3000	9.9		2951	9.8		1046	12.3
Yes d	2961	9.7		2991	9.9		1062	12.5
Respiratory disorder (asthma, COPD)	2120	36.1		2110	36.0		740	35.5
Age	1297	22.1		1295	22.1		501	24.0
Chronical disease	903	15.4		900	15.4		340	16.3
Cardiovascular disease	734	12.5		732	12.5		270	13.0
Diabetes	590	10.0		590	10.1		224	10.7
Obesity	586	10.0		584	10.0		228	10.9
Compromised immune system due to disease and/or medication	472	8.0		469	8.0		168	8.1
Smoking	228	4.9		285	4.9		113	5.4
Unknown	134	0.4
Symptoms d
Fatigue	22 785	75.2		22 697	75.2		7134	83.9
Coughing	22 153	73.1		22 066	73.1		6688	78.7
Headache	21 619	71.4		21 531	71.4		6469	76.1
Mild rhinitis	18 211	60.1		18 148	60.2		5254	61.8
Muscle pain	16 919	55.8		16 849	55.8		5285	62.2
Sore throat	15 337	50.6		15 280	50.6		4283	50.4
Fever	14 691	48.5		14 625	48.5		4521	53.2
Coughing up mucus	10 619	35.0		10 589	35.1		3567	42.0
Shortness of breath	10 102	33.3		10 061	33.3		3524	41.4
Loss of taste	6728	26.9					3148	37.0
Nausea/vomiting	4401	14.5		4384	14.5		1647	19.4
Intestinal problems	3849	12.7		3840	12.7		1354	15.9
No complaints	776	2.6		773	2.6		65	0.8
Unknown	97	0.3
Job satisfaction e									5.8 (1.1)
Sleep disturbance e									1.9 (0.9)

^aEmployees with COVID-19, irrespective of full completion of the survey. This sample was used to obtain general RTW rates that were compared to RTW for flu-like symptoms.

^bEmployees with COVID-19 who fully completed the survey.

^cEmployees who fully completed the survey, including the later added questions on loss of taste, job satisfaction, and sleep problems added later.

^dMultiple answers possible.

^eThis question was answered only by employees with first day of absence between 25 January 2021 and 18 March 2022 and a self-estimated RTW of >1 week.