TABLE 2.

Consumption of selected food or water items by case patients and control individuals in the affected areas between 1 September and 31 December 1999

FoodNo. (%) of persons who consumed the food
Cases (n = 189)Controls (n = 202)Odds ratio (95% confidence interval)
Coquina clams155 (82.0)110 (54.4)3.81 (2.33-6.26)
Other clams0 (0.0)2 (1.0)
Mussels37 (19.6)46 (22.8)0.83 (0.49-1.39)
Jackknife clams8 (4.2)4 (1.9)2.19 (0.58-8.89)
Oysters0 (0.0)0 (0.0)
Crustacean shellfish30 (15.9)39 (19.3)0.79 (0.45-1.38)
Vegetables131 (69.3)137 (67.8)1.07 (0.68-1.69)
Spring water156 (82.5)178 (88.1)0.64 (0.35-1.17)
Tap water45 (23.8)54 (26.7)0.86 (0.53-1.39)
Bottled water54 (28.5)55 (27.2)1.07 (0.67-1.71)