Table 3. Poisson regression modeling total number of social contacts.

	Univariate regression			Multivariable regression
Variable	RR	P-value	95% CI	RR	P-value	95% CI
Age category
13–17	ref
18–24	1.13	0.112	0.97–1.31	1.03	0.719	0.86–1.25
25–34	0.89	0.101	0.77–1.02	0.88	0.166	0.74–1.05
35–44	0.97	0.681	0.84–1.12	0.95	0.567	0.80–1.13
45–54	1.03	0.677	0.89–1.19	0.97	0.707	0.81–1.15
55–64	0.74	<0.001	0.64–0.86	0.70	<0.001	0.59–0.84
65+	0.58	<0.001	0.50–0.68	0.49	<0.001	1.41–0.59
Survey week
March 25	ref
April 2	1.05	0.013	1.01–1.10	0.42	<0.001	0.39–0.44
April 16	1.13	<0.001	1.08–1.17	0.43	<0.001	0.41–0.46
May 1	1.25	<0.001	1.20–1.30	0.49	<0.001	0.47–0.51
June 12	2.38	<0.001	2.29–2.47	0.95	0.022	0.90–0.99
June 25	2.58	<0.001	2.47–2.70	-
Nationality
Luxembourgish	ref
French	0.92	0.003	0.88–0.97	0.92	0.001	0.87–97
Portuguese	1.18	<0.001	1.11–1.25	1.18	<0.001	1.11–1.25
Belgian	0.92	0.013	0.86–0.98	0.96	0.237	0.90–1.03
German	0.80	<0.001	0.73–0.88	0.82	<0.001	0.75–0.90
Italian	0.77	<0.001	0.70–0.84	0.83	<0.001	0.76–0.91
Others	0.76	<0.001	0.73–0.80	0.76	<0.001	0.73–0.79
Survey language
German	Ref.
English	0.77	<0.001	0.75–0.80	-	-	-
French	1.04	0.003	1.01–1.07	-	-	-

RR, rate ratio

Full model was adjusted by age, nationality and place of contact. Survey language is not included in the full model due to collinearity.