Table 2 Relationship between method of index case detection and timelinessa of contact tracing for passengers on 22 flights arriving in Vietnam from 6 March to 21 March
From: Timeliness of contact tracing among flight passengers during the COVID-19 epidemic in Vietnam
n (%) | Univariate Associations | Model 1 | Model 2 | Model 3 | |||||
|---|---|---|---|---|---|---|---|---|---|
IRR | 95%CI | IRR | 95%CI | IRR | 95%CI | IRR | 95%CI | ||
Method of index case detection | |||||||||
Mandatory testing | 9 (40.9) | Ref | – | Ref | – | Ref | – | Ref | – |
Self-presentation | 13 (59.1) | 1.61 | 1.11–2.34 | 1.86 | 1.18–2.92 | 1.59 | 1.07–2.34 | 1.94 | 1.17–3.21 |
Percentage of foreigners per flight | |||||||||
≤10% | 7 (31.8) | Ref | – | Ref | – | Ref | – | ||
10.1–20% | 4 (18.2) | 0.9 | 0.51–1.59 | 1.12 | 0.61–2.04 | 1.15 | 0.61–2.14 | ||
20.1–30% | 4 (18.2) | 1.1 | 0.65–1.87 | 0.96 | 0.56–1.65 | 0.89 | 0.51–1.56 | ||
> 30% | 7 (31.8) | 1 | 0.63–1.60 | 0.77 | 0.47–1.28 | 0.74 | 0.44–1.24 | ||
Number of passengers per flightb | |||||||||
< 50 | 2 (9.1) | Ref | – | Ref | – | Ref | – | ||
50–99 | 13 (59.1) | 1.36 | 0.62–2.98 | 1.07 | 0.48–2.42 | 0.91 | 0.38–2.17 | ||
100+ | 7 (31.8) | 1.67 | 0.75–3.73 | 1.34 | 0.58–3.06 | 1.18 | 0.49–2.83 | ||