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Table 3 Frequency (percentage) of subjects reporting symptoms against level of cyanocyanobacteria exposure: low (cell surface area <2.4 mm2/mL), intermediate (2.4 – 12.0 m 12.0 mm2/mL) and high (>12.0 mm2/mL).

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

Symptoms Cyanobacteria exposure  
   Low n(%) Intermediate n (%) High n (%) p-value
Any symptom      0.42
  None 569 (70) 134 (74) 99 (67)  
  Mild 147 (18) 28 (16) 34 (23)  
  Moderate/severe 94 (12) 18 (10) 14 (10)  
Ear symptoms      0.75
  None 895 (96) 199 (98) 159 (96)  
  Mild 21 (2) 3 (2) 4 (2)  
  Moderate/severe 12 (1) 1 (1) 3 (2)  
Eye symptoms      0.75
  None 872 (94) 196 (95) 154 (95)  
  Mild 41 (4) 5 (2) 6 (4)  
  Moderate/severe 18 (2) 5 (2) 3 (2)  
Gastro-intestinal symptoms      0.89
  None 871 (94) 199 (95) 158 (95)  
  Mild 30 (3) 5 (2) 5 (3)  
  Moderate/severe 27 (3) 5 (2) 3 (2)  
Respiratory symptoms      0.57
  None 691 (86) 169 (88) 122 (82)  
  Mild 87 (11) 19 (10) 22 (15)  
  Moderate/severe 29 (4) 5 (3) 5 (3)  
Cutaneous symptoms      0.52
  None 875 (95) 197 (96) 159 (96)  
  Mild 23 (3) 6 (3) 6 (4)  
  Moderate/severe 20 (2) 2 (1) 1 (1)