Estimate of incidence and cost of recreational waterborne illness on United States surface waters

Table 2 Attributable risks (95% CI) for the development of symptoms among water recreators, by activity

	Incidental-Contact: Fishing^a			Other Incidental-Contact^b			Swimming/Wading^c
	Probability of illness if exposed water/fish/bait (95% CI)	Probability of illness if unexposed (95% CI)	Attributable Risk (95% CI)	Probability of illness if exposed to water (95% CI)	Probability of illness if unexposed (95% CI)	Attributable Risk (95% CI)	Probability of illness if exposed to water (95% CI)	Probability of illness if unexposed (95% CI)	Attributable Risk (95% CI)
AGI	0.053 (0.039, 0.065)	0.038 (0.031, 0.046)	0.015 (−0.003, 0.030)	0.040 (0.036, 0.046)	0.034 (0.028, 0.040)	0.006 (−0.002, 0.014)	0.040 (0.036, 0.043)	0.025 (0.022, 0.029)	0.015 (0.010, 0.020)
Respiratory	--^d	--^d	–	0.182 (0.171, 0.192)	0.210 (0.196, 0.226)	--^e	0.054 (0.050–0.058)	0.049 (0.044, 0.054)	0.005 (−0.002, 0.011)
Eye	--^d	--^d	–	0.081 (0.074, 0.088)	0.073 (0.063, 0.083)	0.008 (−0.004, 0.019)	0.029 (0.027, 0.032)	0.029 (0.026, 0.032)	--^e
Ear	--^d	--^d	–	0.017 (0.014, 0.020)	0.017 (0.011, 0.020)	--^e	0.016 (0.014, 0.018)	0.012 (0.010, 0.015)	0.004 (−0.0001, 0.006)
Skin	0.087 (0.070, 0.102)	0.095 (0.084, 0.107)	--^e	0.083 (0.075, 0.090)	0.093 (0.082, 0.104)	--^e	0.029 (0.027, 0.032)	0.023 (0.020, 0.027)	0.006 (0.002, 0.010)

^a Comparing those who fish to the unexposed group (non-water recreators) in CHEERS
^b Comparing those who engage in incidental-contact water recreation (kayaking, canoeing, boating, rowing) to unexposed group (non-water recreators) in CHEERS
^c Comparing those who have any contact with beach water (swimmers/waders) to the unexposed group (non-water recreators) in NEEAR
^d Anglers not expected to have excess risk of respiratory, eye, ear, or skin illness due to nature of fishing exposure
^e No AR calculated, since no excess of illness among the exposed compared to unexposed

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