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Table 3 Adjusted odds ratios for earache at marine and fresh water sites

From: The incidence and health burden of earaches attributable to recreational swimming in natural waters: a prospective cohort study

  All sites Marine Fresh
  AOR 95% CI AOR 95% CI AOR 95% CI
Head immersion swimming 1.67**** 1.35,2.07 1.56*** 1.21,2.00 2.10**** 1.48,2.99
Age (ref. 20-50)       
Age 0–1 2.02** 1.28,3.21 1.55 0.84,2.88 3.00** 1.48,6.07
Age 2–5 1.13 0.83,1.53 1.29 0.90,1.84 0.79 0.45,1.39
Age 6–10 1.27* 1.00,1.61 1.41* 1.07,1.87 0.94 0.61,1.45
Age 11–19 0.88 0.70,1.11 1.00 0.77,1.31 0.61* 0.39,0.96
Over 60 0.76+ 0.57,1.01 0.82 0.59,1.13 0.52+ 0.25,1.07
Non-white race 1.24 0.95,1.62 1.33** 1.08,1.63 1.11 0.73,1.68
Female 1.29** 1.10,1.52 1.27* 1.06,1.54 1.35+ 1.00,1.83
Unfamiliar animal contact 1.57*** 1.23,2.00 1.72*** 1.28,2.31 1.31 0.86,2.00
Other swimming1 1.60**** 1.36,1.89 1.61**** 1.33,1.96 1.58** 1.16,2.16
Used insect repellent 1.41** 1.09,1.81 1.44** 1.11,1.88 1.21 0.53,2.77
Allergies 1.61**** 1.33,1.95 1.76**** 1.41,2.21 1.31 0.91,1.88
Asthma 1.46** 1.13,1.87 1.38* 1.03,1.86 1.71* 1.05,2.80
  1. + p <0.1, p <0.05, p <0.01, p <0.001, p <0.0001.
  2. AOR = Adjusted Odds Ratio, 95% CI = 95% Confidence Interval.
  3. 1Other head immersion swimming in the 1-week prior to the beach visit. Estimates from a logistic regression model with a random intercept for beach.