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The logistic regressions showed that, of the environmental predictors included in the model, only tidal conditions showed a statistically significant influence on the presence or absence of an exceedance (Table 1). Enterococci exceedance was 2.475 times more likely to occur at high tide versus low tide, and 1.252 times more likely at high tide versus slack tide.

Table 1

Odds ratio estimates between tidal conditions as computed from logistic regression

Odds ratio estimates
EffectPoint estimate95% Wald
confidence limits
Tidal Conditions 1 vs 3 2.475 1.661 3.687 
Tidal Conditions 2 vs 3 1.252 0.866 1.811 
Odds ratio estimates
EffectPoint estimate95% Wald
confidence limits
Tidal Conditions 1 vs 3 2.475 1.661 3.687 
Tidal Conditions 2 vs 3 1.252 0.866 1.811 

Tidal conditions as reported by the Florida Department of Health are coded as 1 = High Tide, 2 = Slack Tide, and 3 = Low Tide.

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