Table 2.

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

	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

¹Excluding waders, those with earache at baseline, earache due to allergy and those with missing data on earache at follow up.

²Categories for age do not add to 39,418 due to missing values.