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Table 4 Frequency (percentage) and binary logistic regression estimates of crude and multivariable O.R. and associated 95% confidence intervals (95%CI).

From: Epidemiology of recreational exposure to freshwater cyanobacteria – an international prospective cohort study

  Exposure Symptoms    
  Cyanobacterial cell surface area1 None Present Crude models2 Multivariable3
   n (%) n (%) O.R. (95%CI) O.R. (95%CI)
Any symptom
  Low 569 (70) 241 (30) 1 1
  Intermediate 134 (74) 46 (26) 0.8 (0.6–1.2) 0.8 (0.6–1.3)
  High 99 (67) 48 (33) 1.6 (1.0–2.7) 1.7 (1.0–2.9)
Ear symptoms
  Low 895 (96) 33 (4) 1 1
  Intermediate 199 (98) 4 (2) 0.6 (0.2–1.5) 0.5 (0.2–1.5)
  High 159 (96) 7 (4) 1.9 (0.6–6.5) 2.0 (0.6–7.1)
Eye symptoms
  Low 872 (94) 59 (6) 1 1
  Intermediate 196 (95) 10 (5) 0.8 (0.4–1.8) 0.8 (0.4–1.9)
  High 154 (95) 9 (6) 0.6 (0.2–1.6) 0.6 (0.3–1.7)
G-I symptoms
  Low 871 (94) 57 (6) 1 1
  Intermediate 199 (95) 10 (5) 0.9 (0.4–1.7) 0.9 (0.4–1.8)
  High 158 (95) 8 (5) 0.9 (0.3–2.2) 0.9 (0.4–2.2)
Respiratory symptoms
  Low 691 (86) 116 (14) 1 1
  Intermediate 169 (88) 24 (12) 1.0 (0.6–1.6) 0.9 (0.6–1.6)
  High 122 (82) 27 (18) 2.0 (1.1–3.7) 2.1 (1.1–4.0)
Cutaneous symptoms
  Low 875 (95) 43 (5) 1 1
  Intermediate 197 (96) 8 (4) 0.7 (0.3–1.7) 0.7 (0.3–1.8)
  High 159 (96) 7 (4) 1.9 (0.9–4.3) 1.9 (0.9–4.4)
Fever
  Low 938 (99) 10 (1) 1 1
  Intermediate 208 (99) 3 (1) 1.5 (0.4–5.6) 1.8 (0.5–6.7)
  High 165 (99) 2 (1) 2.0 (0.5–8.7) 1.8 (0.4–8.1)
Any symptom – after exclusion of subjects with recent (5 days prior to recruitment) exposure
  Low 436 (67) 200 (31) 1 1
  Intermediate 74 (69) 33 (31) 0.9 (0.6–1.5) 0.9 (0.6–1.5)
  High 71 (69) 32 (31) 1.5 (0.8–2.9) 1.6 (0.8–3.2)
  1. 1: Low = <2.4 mm2/mL; intermediate = 2.4 - 12.0 mm2/mL; high = >12.0 mm2/mL
  2. 2: Adjusted for geographic region (QLD, NSW, Florida) as a design variable and clustered by household
  3. 3: Adjusted for geographic region (QLD, NSW, Florida), age-group, sex, smoking and reported prior history of asthma, hay fever or eczema, and clustered by household