Table 2 The proportions of travellers positive in high and low risk countries determined using cut-off levels for R 0 when R 0 was estimated using t = 10, 16 and 23 days. Note that data from Saint Lucia and Curacao were not used to estimate proportions when R 0 was estimated using t = 10 and 23 days
t-value used to estimate R 0 | Cut-off for R 0 used to determine high and low risk countries | Proportion (%) positive in ‘high risk’ group | Proportion (%) positive in ‘low risk’ group |
|---|---|---|---|
10 days | 1.98 | 86/1480 (5.8) | 5/2042 (0.2) |
16 days | 2.76 | 67/596 (11.2) | 25/2955 (0.1) |
23 days | 3.30 | 67/596 (11.2) | 24/2905 (0.1) |