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Table 1 Characteristics of possible outbreaks by ship class in the 5th fleet during October 2000 – September 2001

From: Epidemic infectious gastrointestinal illness aboard U.S. Navy ships deployed to the Middle East during peacetime operations – 2000–2001

Ship Type Average shipboard population nships Ship weeks npossible outbreaks Mean duration (weeks)1 Cumulative attack risk (%) Ship Type AR2 (per 100 ship-weeks)
Carrier 4951 5 45 3 2.7 3.3 6.7
Amphibious assault 669 7 56 2 5.0 7.5 3.5
Cruiser 384 6 50 0 na na na
Destroyer 321 18 120 5 5.4 3.8 4.2
Combat Support 551 3 22 1 (3.0) (1.6) 4.5
Frigate 237 5 38 0 na na na
  1. 1. calculation based on only those ships within the class with outbreaks
  2. 2. Rate of possible outbreaks per ship-week of observation time
  3. na = not applicable