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Table 4 Adjusted Odds Ratios for illness risk among swimmers for a 1 log10 increase in indicator density1

From: Rapidly measured indicators of recreational water quality and swimming-associated illness at marine beaches: a prospective cohort study

  GI Diarrhea URI
  AOR 95% CI AOR 95% CI AOR 95% CI
Enterococcus CFU2
   8:00 AM 1.20 0.91-1.59 1.33 0.92-1.91 1.04 0.73-1.46
   11:00 AM 1.16 0.92-1.45 1.19 0.89-1.6 1.13 0.88-1.46
   Daily 1.16 0.84-1.61 1.22 0.81-1.86 1.11 0.75-1.63
Enterococcus CCE Δ 3
   8:00 AM 1.94 1-3.8 2.57 1.15-5.73 1.46 0.65-3.29
   11:00 AM 2.08 1.18-3.67 2.54 1.29-4.99 1.62 0.86-3.04
   Daily 2.67 1.34-5.34 3.57 1.57-8.13 1.83 0.76-4.39
Bacteroidales CCE Δ 3
   8:00 AM 1.61 1.21-2.16 1.69 1.11-2.58 1.13 0.84-1.52
   11:00 AM 1.43 1.02-1.99 1.40 0.92-2.14 0.93 0.67-1.29
   Daily 1.67 1.16-2.39 1.68 1.08-2.61 0.96 0.66-1.38
Fecal Bacteroides CCE Δ 3
   8:00 AM 1.30 0.99-1.69 1.34 0.94-1.91 1.12 0.81-1.54
   11:00 AM 1.15 0.91-1.45 1.14 0.84-1.54 0.93 0.72-1.2
   Daily 1.27 0.98-1.64 1.26 0.9-1.75 0.95 0.69-1.31
Clostridia sp. CCE Δ 3
   8:00 AM 1.81 0.96-3.39 1.43 0.67-3.08 1.05 0.56-1.95
   11:00 AM 1.32 0.68-2.56 1.46 0.6-3.55 0.93 0.54-1.61
   Daily 1.87 0.75-4.67 1.68 0.56-5.05 1.24 0.49-3.16
Enterococcus CCE Δ Δ 3
   8:00 AM 1.57 0.83-2.94 2.33 1.06-5.12 1.45 0.69-3.02
   11:00 AM 2.11 1.27-3.52 2.97 1.63-5.42 1.57 0.79-3.11
   Daily 2.56 1.29-5.11 4.42 1.96-9.94 1.88 0.79-4.5
Bacteroidales CCE Δ Δ 3
   8:00 AM 1.71 1.23-2.36 1.87 1.16-3 1.13 0.82-1.55
   11:00 AM 1.51 1.05-2.17 1.56 0.97-2.5 0.86 0.6-1.22
   Daily 1.91 1.26-2.9 1.96 1.11-3.47 0.88 0.59-1.31
Fecal Bacteroides CCE Δ Δ 3
   8:00 AM 1.29 0.96-1.74 1.38 0.92-2.07 1.15 0.83-1.61
   11:00 AM 1.14 0.88-1.48 1.14 0.82-1.6 0.93 0.71-1.22
   Daily 1.26 0.94-1.68 1.26 0.86-1.86 0.96 0.69-1.33
Clostridia sp. CCE Δ Δ 3
   8:00 AM 1.94 1.16-3.23 1.62 0.86-3.07 0.99 0.56-1.74
   11:00 AM 1.97 1.03-3.77 2.21 0.96-5.13 0.82 0.46-1.46
   Daily 2.76 1.29-5.89 2.45 0.96-6.29 1.05 0.47-2.32
  1. 1: Exposure indices assigned for daily average of all samples, average of 8:00 AM samples and average of 11:00 AM samples
  2. 2: log10 colony forming units per 100 ml
  3. 3: log10 qPCR Calibrator Cell Equivalents per 100 ml
  4. GI: gastrointestinal illness, URI: Upper respiratory illness, AOR: Adjusted Odds Ratio, 95% CI: 95% Confidence Interval