Table 4

Variables linked to bathing and risk of reporting any symptom

VariableTotal casesp ValueOR (1) (95% CI)
Number%
Head immersion4-150
 Non-swimmers2146.11
 Yes12617.40.96 (0.51, 1.8)
 No3289.10.381.44 (0.72, 2.87)
Seabathing
 No2146.11
 <15 min5587.01.03 (0.53, 1.99)
 15–30 min5066.91.01 (0.51, 2.00)
 >30 min5279.31.23 (0.62, 2.45)
 Trend in swimmers0.16(p=0.456)
Total coliforms (CFU/100 ml)4-151
 Non-swimmers2146.11
 0–4998595.60.78 (0.41, 1.50)
 500–24995009.21.40 (0.71, 2.73)
 2500–999913215.2 2.57 (1.19, 5.57)
 ⩾10 000336.10.74 (0.15, 3.66)
 Trend in swimmers0.00014-160 (p=0.000144-160)
Faecal coliforms (CFU/100 ml)4-152
 Non-swimmers2146.11
 0–996496.30.88 (0.45, 1.71)
 100–4995107.51.04 (0.53, 2.06)
 ⩾50041510.11.58 (0.8, 3.12)
 Trend in swimmers0.0264-150 (p=0.0174-150)
Faecal streptococci (CFU/100 ml)4-154
 Non-swimmers2146.11
 0–396417.20.95 (0.49, 1.84)
 40–1193826.30.94 (0.46, 1.91)
 120–5003589.21.39 (0.69, 2.79)
 >50017711.31.72 (0.77, 3.84)
 Trend in swimmers0.096(p=0.0434-150)
Staphylococcus aureus (CFU/100 ml)
 Non-swimmers2146.11
 01086.50.67 (0.25, 1.82)
 1–994026.70.87 (0.43, 1.77)
 100–24953710.21.50 (0.78, 2.87)
 ⩾2505446.20.9 (0.45, 1.77)
 Trend in swimmers0.9(p=0.49)
Pseudomonas aeruginosa (CFU/100 ml)
 Non-swimmers2146.11
 No11007.31.00 (0.54, 1.88)
 Yes4918.80.41.29 (0.65, 2.55
Floating matter
 Non-swimmers2146.11
 No12047.71.13 (0.61, 2.10)
 Yes3877.80.690.80 (0.38, 1.71)
Foam
 Non-swimmers2146.11
 No12768.11.12 (0.61, 2.09)
 Yes3156.30.40.81 (0.38, 1.73)
  • (1) Adjusted for sex, age, personal history of allergy, beach, eating on beach, eating on restaurant, sun exposure, sun protector, and use of sunglasses.

  • 4-150 Missing data: 2.

  • 4-151 Missing data: 67.

  • 4-152 Missing data: 17.

  • 4-154 Missing organism exposure data in 33 cases. *p values below 0.05.

  • 4-160 p values below 0.01.