No evidence for added value of introducing mandatory COVID-19 testing for international travellers entering Norway with a valid EU digital COVID certificate

Figures & data

Table 1. Averaged daily number of travellers and COVID-19 test results, with and without EU COVID Certificate before (26.11.2021–02.12.2021), and after (03.12.2021–12.12.2021) mandatory testing for all.

	Before mandatory testing was introduced		After mandatory testing was introduced
	Without an EU COVID Certificate	With an EU COVID Certificate	Without an EU COVID Certificate	With an EU COVID Certificate
Travellers, N	842.57	22 481.57	1 034.80	23 222.20
Vald PID, N (%)	319.57	16 803.86	357.80	16 859.30
	(37.9%)	(74.8%)	(34.6%)	(72.6%)
Fully vaccinated in the Norwegian Immunisation Registry, N (%)	10.43	15 468.86	15.70	15 295.60
	(3.26%)	(92.06%)	(4.39%)	(90.7%)
Tested arrival, N (%)	146.29	568.85	182.50	7 183.10
	(45.8%)	(3.4%)	(51.0%)	(42.6%)
Positive cases arrival, N (%)	3.86	40.86	2.80	65.60
	(1.2%)	(0.2%)	(0.8%)	(0.4%)

Figure 1. Proportion of travellers tested at an official test station before and after mandatory testing for all was introduced.

Figure 2. Proportion of travellers testing positive shown with dots, estimated best fit based on interrupted time series analysis shown as purple line. Orange line show the extension of the fit before interruption. Confidence band based a 95% confidence interval around the predicted values.

Table 2. Parameter estimates with 95% confidence interval in parenthesis.

	Dependent variable: Prop. confirmed cases 2 days
	Coefficient (95% CI)	p Value
Pre-intervention slope (β1)	0.0001	.48
	(−0.0002, 0.0004)
Changes in level after intervention (β2)	0.0014	.06
	(−0.00001, 0.0029)
Changes in slope after intervention (β3)	−0.0002	.34
	(−0.0005. 0.0002)
Constant (β0)	0.0020	.007
	(0.0006, 0.0034)