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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