Table 4 Media and interquartile range (IQR) of ship characteristics in association with cockroach infestations
From: Surveillance study of vector species on board passenger ships, Risk factors related to infestations
Characteristics | Ferries with cockroach infestations | Ferries without cockroach infestations | |||
|---|---|---|---|---|---|
| Â | No of ferries | Median (IQR) | No of ferries | Median (IQR) | p value |
Ship age | 11 | 30 (25–31) | 10 | 5 (5–5) | 0.003 |
Days since last disinsection | 11 | 40 (39–84) | 9 | 63 (48–67) | 0.2 |
Number of beds | 11 | 308 (193–630) | 10 | 362 (104–758) | 0.7 |
Days since last Exception Deratting Certificate | 7 | 138 (34–141) | 8 | 79.5 (33–126) | 0.9 |
Ship length (m) | 11 | 137 (130–170) | 10 | 157 (124–197) | 0.3 |
Gross tonnage | 9 | 9,124 (6,777–20,446) | 9 | 7,895 (5,651–24,352) | 0.6 |
Passenger capacity | 11 | 1,500 (1,006–1,730) | 10 | 1,645 (1,313–1,890) | 0.3 |
Number of decks | 10 | 7.5 (7–8) | 9 | 8 (8–10) | 0.1 |