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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
  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