Table 3.
Epidemiologic characteristics of imported two P. ovale subspecies
| Variables | P. ovale curtisi (n = 62) N (%) | P. ovale wallikeri (n = 51) N (%) | P value |
|---|---|---|---|
| Sexa | |||
| Male | 61 (98.4) | 51 (100.0) | 1.000 |
| Female | 1 (1.6) | 0 (0.0) | |
| Age(years), mean(SD) | 43.84 ± 9.21 | 43.53 ± 7.82 | 0.850 |
| Occupationa | |||
| Worker | 51 (82.3) | 46 (90.2) | 0.463 |
| Waiter | 7 (11.3) | 3 (5.9) | |
| Other | 4 (6.5) | 2 (3.9) | |
| Previous malaria | |||
| Yes | 44 (71.0) | 41 (80.4) | 0.248 |
| No | 18 (29.0) | 10 (19.6) | |
| Duration of stay overseasa,b | |||
| ≤ 30 | 0 (0.0) | 1 (2.3) | 0.489 |
| ≤ 180 | 6 (11.8) | 7 (16.3) | |
| ≤ 365 | 10 (19.6) | 11 (25.6) | |
| > 365 | 35 (68.6) | 24 (55.8) | |
| Latency period (days)c, median (IQR) | 59.50(23.0–192.75) | 34 (12–112.50) | 0.070 |
aDifferences in proportions were tested by Fisher’s exact test
b94 cases (83.19%; 94/113) with available information of duration of stay overseas
cThe time elapsed, in days, between arrival in China and onset of disease was defined as the latency period. Cases showing onset of symptoms before arrival were not included in the analysis. A case with a record of 1533 days is excluded, as the authenticity is questionable