Variable | Total cases | p Value | OR (1) (95% CI) | ||||
---|---|---|---|---|---|---|---|
Number | % | ||||||
Seabathing | |||||||
No | 214 | 1.9 | 1 | ||||
<15 min | 558 | 2.0 | 1.05 (0.33, 3.41) | ||||
15–30 min | 506 | 2.4 | 1.39 (0.43, 4.55) | ||||
>30 min | 527 | 2.8 | 1.60 (0.49, 5.30) | ||||
Trend in swimmers | 0.35 | (p=0.292) | |||||
Total coliforms (CFU/100 ml) | |||||||
Non-swimmers | 214 | 1.9 | 1 | ||||
0–499 | 859 | 1.7 | 0.96 (0.31, 3.01) | ||||
500–2499 | 500 | 2.6 | 1.64 (0.51, 5.32) | ||||
2500–9999 | 132 | 3.8 | 2.36 (0.60, 9.39) | ||||
⩾10 000 | 33 | 6.1 | 4.13 (0.64, 26.6) | ||||
Trend in swimmers | 0.0466-150 | (p=0.0246-150) | |||||
Faecal coliforms (CFU/100 ml) | |||||||
Non-swimmers | 214 | 1.9 | 1 | ||||
0–99 | 649 | 2.2 | 1.18 (0.38, 3.73) | ||||
100–499 | 510 | 2.2 | 1.16 (0.35, 3.82) | ||||
⩾500 | 415 | 2.9 | 1.71 (0.52, 5.65) | ||||
Trend in swimmers | 0.47 | (p=0.36) | |||||
Faecal streptococci (CFU/100 ml) | |||||||
Non-swimmers | 214 | 1.9 | 1 | ||||
0–39 | 641 | 2.8 | 1.46 (0.47, 4.51) | ||||
40–119 | 382 | 1.6 | 0.88 (0.24, 3.22) | ||||
120–500 | 358 | 2.2 | 1.27 (0.36, 4.44) | ||||
>500 | 177 | 3.4 | 2.05 (0.51, 8.29) | ||||
Trend in swimmers | 0.79 | (p=0.87) | |||||
Staphylococcus aureus (CFU/100 ml) | |||||||
Non-swimmers | 214 | 1.9 | 1 | ||||
0 | 108 | 0.9 | 0.42 (0.04, 4) | ||||
1–99 | 402 | 2.7 | 1.37 (0.42, 4.50) | ||||
100–249 | 537 | 2.4 | 1.32 (0.41, 4.23) | ||||
⩾250 | 544 | 2.4 | 1.32 (0.42, 4.21) | ||||
Trend in swimmers | 0.76 | (p=0.42) | |||||
Pseudomonas aeruginosa (CFU/100 ml) | |||||||
Non-swimmers | 214 | 1.9 | 1 | ||||
No | 1100 | 2.5 | 1.34 (0.45, 3.98) | ||||
Yes | 491 | 2 | 0.73 | 1.10 (0.32, 3.77) | |||
Floating matter | |||||||
Non-swimmers | 214 | 1.9 | 1 | ||||
No | 1204 | 2.3 | 1.28 (0.43, 3.78) | ||||
Yes | 387 | 2.6 | 0.86 | 1.30 (0.35, 4.83) | |||
Foam | |||||||
Non-swimmers | 214 | 1.9 | 1 | ||||
No | 1276 | 2.8 | 1.48 (0.51, 4.34) | ||||
Yes | 315 | 0.6 | 0.062 | 0.31 (0.05, 1.77) |
(1) Adjusted for sex, age, personal history of allergy, beach, sun exposure, and sun protector. Missing data as for table 4.
↵6-150 p values below 0.05.
6-160 p values below 0.01.