Table 1. Comparation between 65 imported cases infected with Omicron variant and 78 imported cases infected with Delta variant.
| Variable |
Cases infected with
Omicron variant (%) (n=65) |
Cases infected with
Delta variant (%) (n=78) |
Chi-square test | P value |
| Abbreviations: SARS-CoV-2=severe acute respiratory syndrome coronavirus 2; Ct values=cycle threshold value; ORF1ab gene=open reading frame 1ab gene; N gene=nucleocapsid protein gene.* P<0.05, the difference is statistically significant.† An imported COVID-19 infected Omicron variant was considered infection during centralized quarantine in other province, so days from entry to test SARS-CoV-2 nucleic acid positive were not calculated.§ Using nonparametric test of Mann-Whitney U test, the statistic for P value was Z. | ||||
| Gender | ||||
| Male | 41 (63.08) | 62 (79.49) | 4.74 | 0.029* |
| Female | 24 (36.92) | 16 (20.51) | ||
| Age (years) | ||||
| 1–10 | 4 (6.15) | 2 (2.56) | 14.28 | 0.027* |
| 11–20 | 2 (3.08) | 0 (0.00) | ||
| 21–30 | 23 (35.38) | 12 (15.38) | ||
| 31–40 | 14 (21.54) | 26 (33.33) | ||
| 41–50 | 13 (20.00) | 26 (33.33) | ||
| 51–60 | 7 (10.77) | 7 (8.97) | ||
| 61–70 | 2 (3.08) | 5 (6.41) | ||
| Type of traveler | ||||
| Passenger | 56 (86.15) | 71 (91.03) | 16.73 | 0.000* |
| Flight crew | 9 (13.85) | 0 (0.00) | ||
| Seaman | 0 (0.00) | 7 (8.97) | ||
| Doses of coronavirus vaccine | ||||
| None | 7 (10.77) | 55 (70.51) | 56.03 | 0.000* |
| 1 | 2 (3.08) | 0 (0.00) | ||
| 2 | 42 (64.62) | 22 (28.21) | ||
| 3 | 11 (16.92) | 1 (1.28) | ||
| 4 | 3 (4.62) | 0 (0.00) | ||
| Days from entry to SARS-CoV-2 nucleic acid positive† | ||||
| 0–3 | 59 (92.19) | 41 (52.56) | 26.82 | 0.000* |
| 4–7 | 5 (7.81) | 32 (41.03) | ||
| 8–10 | 0 (0.00) | 4 (5.13) | ||
| 11–14 | 0 (0.00) | 1 (1.28) | ||
| Ct values of SARS-CoV-2 nucleic acid§ | ||||
| ORF1ab gene | ||||
| Median (Range) | 25.0 (15.0–39.0) | 27.0 (14.0–37.0) | −0.948 | 0.343 |
| N gene | ||||
| Median (Range) | 24.0 (14.0–38.0) | 25.0 (12.0–35.0) | −0.851 | 0.395 |