Table 6

Variables linked to bathing and risk of skin symptoms

Variable		Total cases		p Value	OR (1) (95% CI)
Variable		Number	%	p Value	OR (1) (95% CI)
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			0.046^6-150	(p=0.024^6-150)
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.