Table 2 Logistic regression analyses for Plasmodium qPCR positive results in all the travellers
Variable | Univariate model | Multivariate model | ||
|---|---|---|---|---|
OR (95% CI) | p-value | aOR (95% CI)# | p-value* | |
Sex | ||||
Female | Reference group | 0.0092 | Reference group | 0.6828 |
Male | 0.52 (0.31, 0.85) | 1.13 (0.62, 2.06) | ||
Age (years) | ||||
< 15 | Reference group | 0.0191 | Reference group | 0.9384 |
15 to 29 | 0.57 (0.25, 1.30) | 0.92 (0.38, 2.24) | ||
≥ 30 | 0.37 (0.17, 0.78) | 0.87 (0.37, 2.01) | ||
Arriving by | ||||
Plane | Reference group | < 0.0001 | Reference group | 0.5655 |
Boat | 4.20 (2.45, 7.21) | 1.69 (0.68, 4.21) | ||
Origin (arriving from)a | ||||
Low incidence PNG provinces | Reference group | 0.0004 | Reference group | 0.3703 |
Medium incidence PNG provinces | 1.58 (0.43, 5.73) | 1.74 (0.47, 6.50) | ||
High incidence PNG provinces | 5.02 (1.80, 14.01) | 2.34 (0.72, 7.62) | ||
Time away from Lihir (days)b | ||||
> 12 to 31 | Reference group | < 0.0001 | Reference group | 0.0308 |
32 to 90 | 1.45 (0.49, 4.28) | 1.28 (0.40, 4.09) | ||
91 or more | 4.15 (2.58, 6.66) | 2.53 (1.25, 5.10) | ||
Place while on Lihir | ||||
Mine accommodation | Reference group | < 0.0001 | Reference group | 0.1834 |
Londolovit Town | 5.93 (3.33, 10.56) | 1.80 (0.43, 7.48) | ||
Villages of Lihir | 3.24 (1.88, 5.58) | 1.00 (0.24, 4.17) | ||
Intention of the visit | ||||
Returning resident/VFR | Reference group | < 0.0001 | Reference group | 0.4856 |
Mine worker | 0.24 (0.14, 0.43) | 0.82 (0.19, 3.45) | ||
Trading unrelated to mining | 1.27 (0.67, 2.43) | 1.04 (0.53, 2.04) | ||
Other purpose | 0.45 (0.17, 1.16) | 0.48 (0.17, 1.30) | ||
Slept under net while away from Lihir b | ||||
No | Reference group | 0.2830 | Reference group | 0.6750 |
Yes | 1.28 (0.81, 2.02) | 1.11 (0.68, 1.82) | ||