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Table 2 Head immersion swimmers and non-swimmers, by beach site and age group 1,2

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

  Head under water
  No Yes Total
  No. % No. % No. %
Age category       
1 and under 355 48.1 383 51.9 738 100.0
2–5 379 14.8 2185 85.2 2564 100.0
6–10 340 8.1 3864 91.9 4204 100.0
11–19 1448 21.8 5193 78.2 6641 100.0
20–50 8265 43.0 10970 57.0 19235 100.0
Over 50 3188 59.6 2158 40.4 5346 100.0
Total 13975 36.1 24753 63.9 38728 100.0
Beach       
Boquerón, PR 2915 22.8 9878 77.2 12793 100.0
Edgewater, AL 370 46.8 421 53.2 791 100.0
Fairhope, MI 834 56.8 634 43.2 1468 100.0
Goddard, RI 1558 66.9 772 33.1 2330 100.0
Huntington, OH 1513 74.9 506 25.1 2019 100.0
Surfside, SC 1722 21.5 6274 78.5 7996 100.0
Silver, MI 3324 46.1 3881 53.9 7205 100.0
West, IN 708 37.2 1197 62.8 1905 100.0
Washington Park, IN 1237 42.5 1674 57.5 2911 100.0
Total 14181 36.0 25237 64.0 39418 100.0
  1. 1Excluding waders, those with earache at baseline, earache due to allergy and those with missing data on earache at follow up.
  2. 2Categories for age do not add to 39,418 due to missing values.