Table 2.

Absolute and relative frequency of outbreaks by quarantine measure and testing strategy.

Quarantine measure	Mass testingn (%)	Targeted testing or test-information N/A*n (%)	TotalN (%)
Mass quarantine	50 (65.79%)	26 (34.21%)	76 (100%)
No mass quarantine +	11 (44.00%)	14 (56.00%)	25 (100%)
Total	61 (60.40%)	40 (39.60%)	101 (100%)
Pearson chi2(1) = 3.7340 p = 0.053

Legend: Pearson chi2: chi-square test statistic. p: p-value. *Information on testing strategy not available (not reported). ⁺Includes n=1 centre for which Information on quarantine measures was missing/not reported. n: absolute frequency. %: percentage. N= totals.